Population 1,082 · Census ACS 2020–24
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Population and households in Mammoth Cave
Household size in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 2.30 | 2.51 | 2.68 |
| 2010–14 | 2.16 | 2.53 | 2.73 |
| 2015–19 | 2.35 | 2.52 | 2.71 |
| 2020–24 | 2.12 | 2.51 | 2.65 |
| Change | −0.19 | −0.00 | −0.03 |
Households in Mammoth Cave are small: just 2.12 people on average, compared with 2.65 nationally. That is typical of places where many people live alone or as couples, and fewer have children at home. Since 2006–10, household size has dropped from 2.30, but in a place this small, much of that may be survey noise rather than real change.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 35.4 | 38.5 | 37.7 |
| 2010–14 | 47.0 | 39.3 | 38.6 |
| 2015–19 | 48.2 | 40.0 | 39.6 |
| 2020–24 | 59.8 | 39.9 | 40.1 |
| Change | +24.4 | +1.5 | +2.3 |
With a median age of 59.8, Mammoth Cave is noticeably older than the country as a whole (40.1), an age mix that tilts toward empty nesters and retirees.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 10.2% | 11.7% | 12.3% |
| 2010–14 | 13.2% | 11.9% | 12.3% |
| 2015–19 | 5.2% | 11.8% | 11.6% |
| 2020–24 | 5.0% | 11.9% | 11.6% |
| Change | −5.2 pts | +0.2 pts | −0.6 pts |
Single parents head only 5.0% of households in Mammoth Cave, well below the national share of 11.6%.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Mammoth Cave
Renters in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 21.5% | 30.1% | 33.3% |
| 2010–14 | 19.5% | 32.3% | 35.6% |
| 2015–19 | 17.4% | 32.8% | 36.0% |
| 2020–24 | 11.6% | 31.7% | 34.8% |
| Change | −9.8 pts | +1.5 pts | +1.5 pts |
Only 11.6% of households in Mammoth Cave rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 77.3% have no mortgage at all, well above the national share of 39.8%.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 53.4% | 12.2% | 11.4% |
| 2010–14 | 57.5% | 11.9% | 11.4% |
| 2015–19 | 59.8% | 12.3% | 11.1% |
| 2020–24 | 49.2% | 10.6% | 9.6% |
| Change | −4.2 pts | −1.6 pts | −1.8 pts |
Vacant homes make up 49.2% of the housing in Mammoth Cave, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 1992 | 1977 | 1974 |
| 2010–14 | 1987 | 1979 | 1975 |
| 2015–19 | 1989 | 1980 | 1977 |
| 2020–24 | 1985 | 1982 | 1980 |
| Change | −8 | +5 | +6 |
Homes in Mammoth Cave are a bit newer than the national norm: the median home was built in 1985, versus 1980 across the U.S. The picture is much the same across Kentucky.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | $504 | $657 | $965 |
| 2010–14 | $760 | $728 | $1,040 |
| 2015–19 | $646 | $814 | $1,213 |
| 2020–24 | $1,000 | $1,024 | $1,571 |
| Change | +$496 | +$367 | +$606 |
A typical rental in Mammoth Cave costs $1,000 a month with utilities, well below the national median of $1,571. That is in line with the rest of Kentucky. The typical renter here spends 34.6% of household income on rent, well over the 30% mark often used to define affordable rent, so many renters here are stretched.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Mammoth Cave
Bachelor's degrees in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 4.3% | 21.3% | 28.4% |
| 2010–14 | 5.7% | 22.5% | 29.6% |
| 2015–19 | 13.7% | 24.5% | 32.1% |
| 2020–24 | 11.3% | 27.6% | 35.6% |
| Change | +7.0 pts | +6.2 pts | +7.2 pts |
Fewer adults in Mammoth Cave have a four-year degree than in the country as a whole: 11.3%, against 35.6% nationally.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 72.3% | 81.7% | 84.9% |
| 2010–14 | 72.3% | 83.9% | 86.1% |
| 2015–19 | 73.0% | 86.4% | 87.7% |
| 2020–24 | 88.1% | 88.8% | 89.3% |
| Change | +15.8 pts | +7.2 pts | +4.3 pts |
High school completion in Mammoth Cave is close to the national rate: 88.1% of adults have a diploma or equivalent, against 89.3%.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Mammoth Cave
| Period | Mammoth Cave | Kentucky | U.S. |
|---|---|---|---|
| 2006–10 | 10.0% | 8.4% | 8.1% |
| 2010–14 | 9.8% | 9.5% | 9.4% |
| 2015–19 | 15.1% | 5.8% | 5.6% |
| 2020–24 | 13.3% | 5.1% | 5.4% |
| Change | +3.4 pts | −3.3 pts | −2.7 pts |
Finding work has been harder in Mammoth Cave: 13.3% of the labor force was out of work and looking, well above the national rate of 5.4%. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Mammoth Cave compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Mammoth Cave | 2.12 | 59.8 | 5.0% | 11.6% | 49.2% | 1985 | $1,000 | 11.3% | 88.1% | 13.3% |
| Cub Run | 2.89 | 35.4 | 6.3% | 14.0% | 25.4% | 1991 | $709 | 11.7% | 79.4% | 4.7% |
| Reedyville | 2.45 | 39.5 | 10.8% | 48.8% | 26.2% | 1985 | $812 | 8.0% | 64.5% | 9.7% |
| Iberia | 2.39 | 45.8 | 15.0% | 22.3% | 56.3% | 1990 | $917 | 13.4% | 85.7% | 2.5% |
| Bee Spring | 2.56 | 48.0 | 11.1% | 23.7% | 26.0% | 1988 | $787 | 8.5% | 79.2% | 3.9% |
| Sweeden | 2.49 | 40.6 | 11.2% | 22.8% | 19.8% | 1982 | $773 | 15.8% | 85.1% | 15.8% |
| Anneta | 2.59 | 34.9 | 15.1% | 14.0% | 34.6% | 1990 | $953 | 11.6% | 85.0% | 3.6% |
| Brownsville | 2.51 | 44.7 | 11.4% | 29.2% | 15.8% | 1987 | $726 | 10.3% | 77.6% | 11.3% |
| Snap | 3.08 | 38.3 | 8.9% | 18.9% | 16.8% | 1994 | $903 | 17.0% | 91.3% | 3.3% |
| Northtown | 2.29 | 60.3 | 4.1% | 27.5% | 15.3% | 2000 | $884 | 2.9% | 84.4% | 0.0% |
| Sunfish | 1.98 | 45.8 | 11.6% | 12.4% | 7.2% | 1991 | $765 | 13.0% | 81.4% | 3.2% |
All figures 2020–24.
Cities with similar populations: Petronila, TX · Nimitz, WV · Nordland, WA · Northfield, KY · Nortonville, KS · Oglesby, TX · Onaga, KS · Orchard View, OR · Orient, NY · Parnell, MI
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Mammoth Cave. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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