Jefferson County
Pennsylvania · County seat: Brookville · Active county or equivalent
FIPS code 42065 is Jefferson County, Pennsylvania. With a population of 44,326 (2022 ACS estimate), it ranks #48 in Pennsylvania and #1102 nationally. The state FIPS code for Pennsylvania is 42. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
42065
Population
44,326
2022 ACS · #1102 nationally
Density
67.9/mi²
people per sq mile
Land Area
652
sq miles
Urban/Rural
Nonmetro — urban 2.5K–19.9K, not adjacent to metro
RUCC 7
How This FIPS Code Works
The 5-digit FIPS code 42065 is formed by combining the 2-digit state identifier 42 (Pennsylvania) with the 3-digit county identifier 065. Together they uniquely identify Jefferson County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 42065
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 42065.
Median Household Income
$56,607
ACS B19013_001E
Poverty Rate
14.1%
ACS B17001 (below poverty level)
Median Age
43.7
ACS B01002_001E
Adjacent Counties (6)
Counties that share a border with Jefferson County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 42065.
Federal Datasets Using Code 42065
FIPS code 42065 appears as the county identifier in the following federal datasets. Analysts joining data across these sources use this code as the common geographic key.
Using FIPS Code 42065 in Code
Common patterns for querying federal datasets by this county's FIPS code. The leading zeros are significant — always treat FIPS codes as strings, not integers.
import requests
url = "https://api.census.gov/data/2022/acs/acs5"
params = {
"get": "NAME,B19013_001E,B01003_001E",
"for": "county:065",
"in": "state:42",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Jefferson County, Pennsylvania, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '42065';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '42'
AND county_fips = '065';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 42065 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "42",
county = "065",
year = 2022
)ZIP Codes in Jefferson County
ZIP codes do not align perfectly with county boundaries — a single ZIP code can span multiple counties, and a county can contain parts of many ZIP codes. The ratios below (from the Census 2020 ZCTA relationship file) show the land area share of each ZCTA that falls within Jefferson County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 15863 | 100.0% |
| 15715 | 100.0% |
| 15730 | 100.0% |
| 15733 | 100.0% |
| 15744 | 100.0% |
| 15764 | 100.0% |
| 15776 | 100.0% |
| 15778 | 100.0% |
| 15780 | 100.0% |
| 15781 | 100.0% |
| 15784 | 100.0% |
| 15825 | 100.0% |
| 15847 | 100.0% |
| 15851 | 100.0% |
| 15770 | 100.0% |
| 15711 | 100.0% |
| 15840 | 97.0% |
| 15824 | 94.2% |
| 15767 | 83.6% |
| 15865 | 78.7% |
| 15829 | 68.9% |
| 15864 | 56.2% |
| 15860 | 52.6% |
| 15828 | 42.5% |
| 16240 | 36.7% |
| 15823 | 15.1% |
| 16222 | 8.2% |
| 15853 | 6.4% |
| 15772 | 3.5% |
| 15801 | 0.8% |