Perry County
Pennsylvania · County seat: Bloomfield · Active county or equivalent
FIPS code 42099 is Perry County, Pennsylvania. With a population of 45,941 (2022 ACS estimate), it ranks #47 in Pennsylvania and #1068 nationally. Perry County is part of the Harrisburg-Carlisle, PA. 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
42099
Population
45,941
2022 ACS · #1068 nationally
Density
83.3/mi²
people per sq mile
Land Area
551
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 42099 is formed by combining the 2-digit state identifier 42 (Pennsylvania) with the 3-digit county identifier 099. Together they uniquely identify Perry County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 42099
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 42099.
Median Household Income
$76,103
ACS B19013_001E
Poverty Rate
8.2%
ACS B17001 (below poverty level)
Median Age
43.7
ACS B01002_001E
Metropolitan Area
Adjacent Counties (5)
Counties that share a border with Perry County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 42099.
Federal Datasets Using Code 42099
FIPS code 42099 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 42099 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:099",
"in": "state:42",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Perry County, Pennsylvania, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '42099';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '42'
AND county_fips = '099';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 42099 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "42",
county = "099",
year = 2022
)ZIP Codes in Perry 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 Perry County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 17090 | 100.0% |
| 17047 | 100.0% |
| 17068 | 100.0% |
| 17069 | 100.0% |
| 17071 | 100.0% |
| 17074 | 100.0% |
| 17006 | 100.0% |
| 17024 | 100.0% |
| 17037 | 100.0% |
| 17040 | 100.0% |
| 17053 | 99.3% |
| 17020 | 96.9% |
| 17062 | 76.3% |
| 17045 | 67.1% |
| 17021 | 15.8% |
| 17035 | 6.1% |