Marquette County
Michigan · County seat: Marquette · Active county or equivalent
FIPS code 26103 is Marquette County, Michigan. With a population of 66,376 (2022 ACS estimate), it ranks #30 in Michigan and #812 nationally. Marquette County is part of the Marquette, MI. The state FIPS code for Michigan is 26. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
26103
Population
66,376
2022 ACS · #812 nationally
Density
36.7/mi²
people per sq mile
Land Area
1,808
sq miles
Urban/Rural
Nonmetro — urban 20K+, not adjacent to metro
RUCC 5
How This FIPS Code Works
The 5-digit FIPS code 26103 is formed by combining the 2-digit state identifier 26 (Michigan) with the 3-digit county identifier 103. Together they uniquely identify Marquette County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 26103
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 26103.
Median Household Income
$63,115
ACS B19013_001E
Poverty Rate
13.6%
ACS B17001 (below poverty level)
Median Age
39.1
ACS B01002_001E
Metropolitan Area
Adjacent Counties (8)
Counties that share a border with Marquette County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 26103.
Federal Datasets Using Code 26103
FIPS code 26103 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 26103 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:103",
"in": "state:26",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Marquette County, Michigan, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '26103';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '26'
AND county_fips = '103';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 26103 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "26",
county = "103",
year = 2022
)ZIP Codes in Marquette 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 Marquette County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 49808 | 100.0% |
| 49814 | 100.0% |
| 49833 | 100.0% |
| 49841 | 100.0% |
| 49849 | 100.0% |
| 49855 | 100.0% |
| 49866 | 100.0% |
| 49871 | 100.0% |
| 49885 | 84.5% |
| 49879 | 63.5% |
| 49880 | 57.1% |
| 49818 | 52.3% |
| 49831 | 32.4% |
| 49861 | 9.5% |
| 49822 | 1.9% |