Where we cover
Adams County and the Hanover area of western York County, Pennsylvania. Each town below has its own page built on its own Census housing data, because a 1938 borough and a 1993 borough nine miles apart do not have the same problem.
| Town | From Gettysburg | Median year built | Built before 1940 |
|---|---|---|---|
| Gettysburg | the borough itself | 1942 | 47.5% |
| Cumberland Township | wrapping the south and west of Gettysburg borough | 1983 | 5.2% |
| Straban Township | about 6 miles northeast | 1979 | 12.5% |
| Mount Joy Township | about 6 miles southeast | 1980 | 12.3% |
| Fairfield | about 8 miles west-southwest | 1947 | 40.4% |
| Carroll Valley | about 10 miles southwest | 1993 | 2.2% |
| Biglerville | about 7 miles north | 1963 | 20.6% |
| Arendtsville | about 7 miles north-northwest | 1951 | 40.7% |
| Bendersville | about 11 miles north | 1951 | 34.8% |
| York Springs | about 14 miles north-northeast, the farthest of these towns from Gettysburg | 1938 | 54.3% |
U.S. Census Bureau, American Community Survey 2024 5-year estimates (tables B25035, B25034, B25003), accessed via the Census Reporter API, retrieved 2026-09-15.
County context
These figures describe Adams County as a whole rather than any single town. Adams County averages 43.11 inches of precipitation a year, plus about 22 inches of snow, most of it between December and February. There were 26 flash flood events in Adams County between 1996 and 2019. Two watersheds split the county almost evenly: about half drains northeast to the Susquehanna by way of Conewago Creek, and about half drains south and west toward the Potomac by way of the Monocacy. Thirty-six community water systems serve the county, each running its own sources and treatment, alongside roughly 101 public wells.
Sources: Adams County Hazard Mitigation Plan (2020 update), retrieved 2026-09-15. Adams County Stormwater Management Plan, retrieved 2026-09-15.
Every municipality in Adams County takes part in the National Flood Insurance Program except New Oxford Borough, and the countywide flood maps carry a July 22, 2020 date.
Source: Adams County Stormwater Management Plan and the Carroll Valley floodplain ordinance, retrieved 2026-09-15.