| ZIP Codes: | 7 ZIP Codes (5 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 274 / 920 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:14:18 PM |
| Population: | 20,876 [See All] |
| FIPS: | 55047 |
| Land Area: | 445 sq mi |
| Water Area: | 30 sq mi |
| Coordinates: | 43.7894, -89.0911 |
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20,876 residents live across 7 ZIPs covering 445 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 20,804 to 20,876 from 2014 to 2024 — a +0.3% change. 4 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 54941 (Green Lake, $79,146 median) and poorest ZIP 53947 (Marquette, $56,250) are 10.9 miles apart — a 1.4× income gap across local geography.
Median home values vary 1.9× across this county — from $147,900 in 53939 (Kingston) to $276,000 in 54941 (Green Lake).
Density varies 29× across the county — from 30 people/sq mi in 53946 (Markesan) to 854 in 53939 (Kingston).
Educational attainment ranges from 7.3% bachelor's+ in 53947 (Marquette) to 38.6% in 54941 (Green Lake) — the breadth of educational profiles across the area.
Within Wisconsin, this is the #50 most populous of 73 counties and ranks #55 for median household income .
Weighted by population, the typical household earns about $68,680 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.3% of adults age 25+ hold a bachelor's degree or higher (3,289 of 14,774 reporting).
5 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 54923 | Berlin | Standard | 8,793 | $66,223 | 142.1 | -0.5% |
| 53946 | Markesan | Standard | 4,333 | $72,450 | 146.1 | -7.4% |
| 54968 | Princeton | Standard | 2,762 | $65,758 | 67.5 | -6.7% |
| 54941 | Green Lake | Standard | 2,563 | $79,146 | 37.4 | 6.3% |
| 53926 | Dalton | Standard | 1,951 | $62,917 | 51.2 | 24.3% |
| 53939 | Kingston | PO Box | 251 | $70,833 | 0.3 | 5.9% |
| 53947 | Marquette | PO Box | 223 | $56,250 | 0.3 | 110.4% |