| ZIP Codes: | 15 ZIP Codes (13 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 274 / 920 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:14:18 PM |
| Population: | 98,790 [See All] |
| FIPS: | 55039 |
| CBSA: | Fond du Lac, WI |
| Land Area: | 728 sq mi |
| Water Area: | 12 sq mi |
| Coordinates: | 43.7747, -88.4967 |
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98,790 residents live across 15 ZIPs covering 728 sq mi, served by 13 distinct USPS-recognized cities.
Population moved from 96,481 to 98,790 from 2014 to 2024 — a +2.4% change. 9 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 54932 (Eldorado, $110,125 median) and poorest ZIP 54935 (Fond Du Lac, $63,144) are 9.4 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.7× across this county — from $180,200 in 54935 (Fond Du Lac) to $307,000 in 53010 (Campbellsport).
Density varies 56× across the county — from 31 people/sq mi in 53079 (Saint Cloud) to 1,729 in 54935 (Fond Du Lac).
Educational attainment ranges from 12.0% bachelor's+ in 54979 (Van Dyne) to 28.2% in 53019 (Eden) — the breadth of educational profiles across the area.
Within Wisconsin, this is the #16 most populous of 73 counties and ranks #8 for median household income .
Weighted by population, the typical household earns about $76,047 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.5% of adults age 25+ hold a bachelor's degree or higher (15,681 of 69,792 reporting).
13 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 |
|---|---|---|---|---|---|---|
| 54935 | Fond Du Lac | Standard | 41,613 | $63,144 | 24.1 | -1.5% |
| 54937 | Fond Du Lac | Standard | 21,687 | $81,841 | 129.2 | 13.7% |
| 54971 | Ripon | Standard | 10,907 | $66,699 | 109.1 | 1.2% |
| 53010 | Campbellsport | Standard | 7,444 | $95,391 | 100.7 | -3.8% |
| 53065 | Oakfield | Standard | 2,351 | $99,583 | 44.1 | 3.2% |
| 53049 | Malone | Standard | 2,298 | $93,424 | 49.8 | 0.1% |
| 53919 | Brandon | Standard | 2,292 | $97,019 | 63.2 | -14.4% |
| 54979 | Van Dyne | Standard | 2,037 | $109,868 | 35.7 | 44.6% |
| 53057 | Mount Calvary | Standard | 1,882 | $105,909 | 29.8 | 10.7% |
| 53019 | Eden | Standard | 1,876 | $84,559 | 36.8 | -2.6% |
| 53079 | Saint Cloud | Standard | 1,420 | $86,667 | 46.0 | 3.6% |
| 54974 | Rosendale | Standard | 1,415 | $97,222 | 26.3 | 4.4% |
| 54932 | Eldorado | Standard | 1,218 | $110,125 | 32.1 | -10.7% |
| 53931 | Fairwater | PO Box | 350 | $71,250 | 0.8 | 37.8% |
| 54936 | Fond Du Lac | PO Box | — | — | 0.0 | — |