In Castalia there are 10 residential internet providers covering 100.00% of the city. The average home can get speeds up to 988 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
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10 Internet Service Providers in Castalia
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in Castalia are not shown.
Castalia Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Availability maps for all providers in Castalia
Using the dropdown below, please select a provider. Green indicates nearly all homes have service, red indicates few homes have service, and blank indicates no service.
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Internet service is available in 100.00% of Castalia. Using our interactive availability map, you can compare service areas for different providers, we include fiber, cable, DSL, or fixed wireless internet service for all providers who offer it. You will notice that some providers might be listed multiple times for each service. If you find no providers cover the location you're looking at, you can opt for satellite service. The most widely available provider is AcenTek. Now you can call companies in Castalia with more confidence that they might be available.
How fast are internet speeds in Castalia?
The map below shows maximum internet speeds by area in Castalia.
Internet Speed Key
The average Castalia home can get up to 988 Mbps on their internet plan. For most people, the fastest download speed in the city is 1,000 Mbps, which 98.64% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, less than 1% of homes can only purchase plans up to 25 Mbps. See the internet provider details below for info about their speed and coverage in Castalia.
Internet speeds tend to be faster in the central parts of Castalia, and slower in the northeast areas of the city.
What type of internet should I choose in Castalia?
The fastest internet for you may vary based on where in Castalia you live. If speed is your main concern, fiber will be the fastest internet in the city.
- Fiber is the fastest internet type for 98.64% of Castalia homes.
- Cable is fastest for less than 1% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 1.36%.
- Satellite internet may be the only option for less than 1% of Castalia homes.
Internet Market Health in Castalia
Internet Competition Key
The map shows how competitive the Castalia internet service market is. Areas in green have more alternatives, areas in yellow have a few choices, and areas in red may have only one provider. More competition usually means faster speeds and better prices for you, the customer.
Below are quick facts on internet competition and market health in Castalia based on what connections the average home has availabile:
- Average number of internet service providers to a home: 4.8 (healthy)
- Average types of service (fiber, cable, DSL, etc): 2.2 (unhealthy)
- Average providers with broadband (25 Mbps+) speeds: 4.0 (unhealthy)
Overall, competition is unhealthy.
Castalia internet customers have the ability to buy internet service from 2 to 8 different providers, depending on where they live. For different types of service, Castalia homes have between 1 and 3 options. The type(s) of service available are fixed wireless, fiber, and dsl, though these may vary depending on the region within the city.
When it comes to broadband download speeds faster than 25 Mbps, the situation is worse. Castalia internet customers who want faster speeds have between 1 and 8 choices of companies offering speeds up to or over 25 Mbps.
More internet companies with faster speeds means fewer monopolies and better prices for customers. In promoting a free market for internet, Castalia needs improvement.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in Castalia, along with details on where in Castalia and at what speeds.
AcenTek Fiber in Castalia, IA
AcenTek fiber coverage
About 82.35%, or 546 people, have AcenTek fiber internet available to them in the city. The company covers the entire Castalia area. AcenTek is a large internet service provider internet service providers in the US, with internet service available in much of Castalia.
AcenTek fiber download speeds
AcenTek is one of the fastest when comparing download speeds to all other internet providers in Castalia. Versus other fiber providers in the area, AcenTek fiber is one of the fastest. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from AcenTek goes up to 1,000 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
AcenTek fiber upload speeds
In Castalia download speeds tend to be equal to than upload speeds for AcenTek fiber. Compared to other ISPs, AcenTek is one of the fastest where upload speeds are concerned, and one of the fastest compared to other Castalia fiber providers. AcenTek offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Centurylink DSL in Castalia, IA
Centurylink DSL coverage
About 24.74%, or 164 people, have Centurylink DSL internet available to them in the city. The company covers the southeast, east, and northeast Castalia area. Centurylink is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of Castalia.
Centurylink DSL download speeds
Centurylink is below average when comparing download speeds to all other internet providers in Castalia. Versus other DSL providers in the area, Centurylink DSL is the fastest. There are 3 different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from Centurylink goes up to 80 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Castalia customers is up to 70 Mbps.
Show all download speeds
- 78.7% up to 80.0 Mbps
- 15.2% up to 40.0 Mbps
- 6.1% up to 10.0 Mbps
Centurylink DSL upload speeds
In Castalia download speeds tend to be faster than than upload speeds for Centurylink DSL. Compared to other ISPs, Centurylink is below average where upload speeds are concerned, and the fastest compared to other Castalia DSL providers. Centurylink offers 3 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castalia is up to 10 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Centurylink customers can get speeds up to 8.4 Mbps.
Show all upload speeds
- 78.7% up to 10.0 Mbps
- 15.2% up to 3.0 Mbps
- 6.1% up to 1.0 Mbps
NEIT Fiber in Castalia, IA
NEIT fiber coverage
About 20.81%, or 138 people, have NEIT fiber internet available to them in the city. The company covers the southeast, east, and northeast Castalia area. NEIT is a small internet service provider internet service providers in the US, with internet service available in a small portion of Castalia.
NEIT fiber download speeds
NEIT is one of the fastest when comparing download speeds to all other internet providers in Castalia. Versus other fiber providers in the area, NEIT fiber is one of the fastest. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from NEIT goes up to 1,000 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
NEIT fiber upload speeds
In Castalia download speeds tend to be equal to than upload speeds for NEIT fiber. Compared to other ISPs, NEIT is one of the fastest where upload speeds are concerned, and one of the fastest compared to other Castalia fiber providers. NEIT offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
US Cellular Fixed Wireless in Castalia, IA
US Cellular fixed wireless coverage
About 98.64%, or 654 people, have US Cellular fixed wireless internet available to them in the city. The company covers the entire Castalia area. US Cellular is one of the largest internet service providers internet service providers in the US, with internet service available in most of Castalia.
US Cellular fixed wireless download speeds
US Cellular is below average when comparing download speeds to all other internet providers in Castalia. Versus other fixed wireless providers in the area, US Cellular fixed wireless is below average. There are 2 different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from US Cellular goes up to 25 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Castalia customers is up to 14 Mbps.
Show all download speeds
- 28.7% up to 25.0 Mbps
- 71.3% up to 10.0 Mbps
US Cellular fixed wireless upload speeds
In Castalia download speeds tend to be faster than than upload speeds for US Cellular fixed wireless. Compared to other ISPs, US Cellular is below average where upload speeds are concerned, and below average compared to other Castalia fixed wireless providers. US Cellular offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castalia is up to 3.0 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, US Cellular customers can get speeds up to 1.6 Mbps.
Show all upload speeds
- 28.7% up to 3.0 Mbps
- 71.3% up to 1.0 Mbps
GigFire Fixed Wireless in Castalia, IA
GigFire fixed wireless coverage
About 92.46%, or 613 people, have GigFire fixed wireless internet available to them in the city. The company covers the entire Castalia area. GigFire is a large internet service provider internet service providers in the US, with internet service available in most of Castalia.
GigFire fixed wireless download speeds
GigFire is below average when comparing download speeds to all other internet providers in Castalia. Versus other fixed wireless providers in the area, GigFire fixed wireless is above average. There are 2 different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from GigFire goes up to 150 Mbps, the slowest package only goes up to 140 Mbps, and the city-wide average maximum speed for Castalia customers is up to 149 Mbps.
Show all download speeds
- 92.8% up to 150.0 Mbps
- 7.2% up to 140.0 Mbps
GigFire fixed wireless upload speeds
In Castalia download speeds tend to be faster than than upload speeds for GigFire fixed wireless. Compared to other ISPs, GigFire is below average where upload speeds are concerned, and above average compared to other Castalia fixed wireless providers. GigFire offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castalia is up to 130 Mbps. Some customers have slower plan choices, which only go up to 40 Mbps. On average, GigFire customers can get speeds up to 124 Mbps.
Show all upload speeds
- 92.8% up to 130.0 Mbps
- 7.2% up to 40.0 Mbps
Nextlink Fixed Wireless in Castalia, IA
Nextlink fixed wireless coverage
About 71.34%, or 473 people, have Nextlink fixed wireless internet available to them in the city. The company covers the southeast, east, central, northeast, west, south, southwest, and northwest Castalia area. Nextlink is one of the largest internet service providers internet service providers in the US, with internet service available in much of Castalia.
Nextlink fixed wireless download speeds
Nextlink is above average when comparing download speeds to all other internet providers in Castalia. Versus other fixed wireless providers in the area, Nextlink fixed wireless is the fastest. There are 4 different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from Nextlink goes up to 1,000 Mbps, the slowest package only goes up to 100 Mbps, and the city-wide average maximum speed for Castalia customers is up to 568 Mbps.
Show all download speeds
- 15.6% up to 1,000.0 Mbps
- 77.0% up to 500.0 Mbps
- 6.3% up to 400.0 Mbps
- 1.1% up to 100.0 Mbps
Nextlink fixed wireless upload speeds
In Castalia download speeds tend to be faster than than upload speeds for Nextlink fixed wireless. Compared to other ISPs, Nextlink is below average where upload speeds are concerned, and the fastest compared to other Castalia fixed wireless providers. Nextlink offers 3 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castalia is up to 1,000 Mbps. Some customers have slower plan choices, which only go up to 20 Mbps. On average, Nextlink customers can get speeds up to 240 Mbps.
Show all upload speeds
- 15.6% up to 1,000.0 Mbps
- 83.3% up to 100.0 Mbps
- 1.1% up to 20.0 Mbps
T-Mobile Home Internet Fixed Wireless in Castalia, IA
T-Mobile Home Internet fixed wireless coverage
About 51.89%, or 344 people, have T-Mobile Home Internet fixed wireless internet available to them in the city. The company covers the southeast, northeast, east, north, west, and central Castalia area. T-Mobile Home Internet is one of the largest internet service providers internet service providers in the US, with internet service available in a majority of Castalia.
T-Mobile Home Internet fixed wireless download speeds
T-Mobile Home Internet is below average when comparing download speeds to all other internet providers in Castalia. Versus other fixed wireless providers in the area, T-Mobile Home Internet fixed wireless is below average. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from T-Mobile Home Internet goes up to 25 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
T-Mobile Home Internet fixed wireless upload speeds
In Castalia download speeds tend to be faster than than upload speeds for T-Mobile Home Internet fixed wireless. Compared to other ISPs, T-Mobile Home Internet is below average where upload speeds are concerned, and below average compared to other Castalia fixed wireless providers. T-Mobile Home Internet offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
Allamakee-Clayton Electric Cooperative Fixed Wireless in Castalia, IA
Allamakee-Clayton Electric Cooperative fixed wireless coverage
About 28.05%, or 186 people, have Allamakee-Clayton Electric Cooperative fixed wireless internet available to them in the city. The company covers the east, northeast, southeast, southwest, and north Castalia area. Allamakee-Clayton Electric Cooperative is a small internet service provider internet service providers in the US, with internet service available in a small portion of Castalia.
Allamakee-Clayton Electric Cooperative fixed wireless download speeds
Allamakee-Clayton Electric Cooperative is below average when comparing download speeds to all other internet providers in Castalia. Versus other fixed wireless providers in the area, Allamakee-Clayton Electric Cooperative fixed wireless is below average. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from Allamakee-Clayton Electric Cooperative goes up to 25 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
Allamakee-Clayton Electric Cooperative fixed wireless upload speeds
In Castalia download speeds tend to be faster than than upload speeds for Allamakee-Clayton Electric Cooperative fixed wireless. Compared to other ISPs, Allamakee-Clayton Electric Cooperative is below average where upload speeds are concerned, and below average compared to other Castalia fixed wireless providers. Allamakee-Clayton Electric Cooperative offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 10 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 10.0 Mbps
NEIT Fixed Wireless in Castalia, IA
NEIT fixed wireless coverage
About 6.79%, or 45 people, have NEIT fixed wireless internet available to them in the city. The company covers the central, east, and northeast Castalia area. NEIT is a small internet service provider internet service providers in the US, with internet service available in a very small piece of Castalia.
NEIT fixed wireless download speeds
NEIT is the slowest when comparing download speeds to all other internet providers in Castalia. Versus other fixed wireless providers in the area, NEIT fixed wireless is the slowest. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from NEIT goes up to 10 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 10.0 Mbps
NEIT fixed wireless upload speeds
In Castalia download speeds tend to be faster than than upload speeds for NEIT fixed wireless. Compared to other ISPs, NEIT is the slowest where upload speeds are concerned, and the slowest compared to other Castalia fixed wireless providers. NEIT offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 1.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1.0 Mbps
Castalia Internet by Area
This information is most helpful to those looking for homes or considering moving to Castalia or any of the areas nearby.
How does internet in Castalia compare to the rest of Iowa?
Internet speeds in Castalia are slower versus the average speeds in Iowa: 2,759 Mbps in Iowa versus 988 Mbps in the city. The state has similar internet availability compared to the city. Average internet coverage in Iowa is 98.80% versus 100.00% in Castalia.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around Castalia are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does internet service look like in other cities?
Below are cities nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Cities
- Postville, IA: equal internet coverage, faster speeds
- Ossian, IA: equal internet coverage, faster speeds
- Clermont, IA: less internet coverage, faster speeds
- Luana, IA: equal internet coverage, faster speeds
- Nordness, IA: equal internet coverage, slower speeds
- Ludlow, IA: equal internet coverage, faster speeds
- Festina, IA: equal internet coverage, faster speeds
- Elgin, IA: less internet coverage, slower speeds
- Calmar, IA: equal internet coverage, slower speeds
- Gunder, IA: equal internet coverage, slower speeds
Cities with Similar Populations
- Danbury, IA: less internet coverage, slower speeds
- Raisin, CA: equal internet coverage, slower speeds
- Rankin, IL: less internet coverage, faster speeds
- Ravencliff, WV: less internet coverage, faster speeds
- Rhodes, IA: equal internet coverage, slower speeds
- Riggins, ID: less internet coverage, faster speeds
- Elm Hall, MI: equal internet coverage, slower speeds
- Elberon, VA: less internet coverage, faster speeds
- Easton, WA: less internet coverage, slower speeds
- Easton, MI: equal internet coverage, slower speeds