| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 262 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:55:40 PM |
| Population: | 93,487 [See All] |
| FIPS: | 55089 |
| CBSA: | Milwaukee-Waukesha, WI |
| Land Area: | 237 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 43.3653, -87.9633 |
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93,487 residents live across 8 ZIPs covering 237 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 88,785 to 93,487 from 2014 to 2024 — a +5.3% change. 5 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 53097 (Mequon, $135,929 median) and poorest ZIP 53074 (Port Washington, $79,423) are 15.4 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.0× across this county — from $256,000 in 53004 (Belgium) to $499,800 in 53097 (Mequon).
Density varies 10× across the county — from 99 people/sq mi in 53004 (Belgium) to 1,003 in 53092 (Mequon).
Educational attainment ranges from 23.5% bachelor's+ in 53021 (Fredonia) to 69.6% in 53092 (Mequon) — the breadth of educational profiles across the area.
Within Wisconsin, this is the #17 most populous of 73 counties and ranks #4 for median household income with the #18 fastest decade growth .
Weighted by population, the typical household earns about $101,761 across the county — reflecting what a typical resident sees, not a simple ZIP average.
50.8% of adults age 25+ hold a bachelor's degree or higher (33,596 of 66,164 reporting). The most-educated ZIPs cluster around Mequon.
8 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 53092 | Mequon | Standard | 20,886 | $128,156 | 20.8 | -0.1% |
| 53012 | Cedarburg | Standard | 19,183 | $96,090 | 34.8 | 2.5% |
| 53024 | Grafton | Standard | 18,982 | $92,390 | 27.5 | 12.5% |
| 53074 | Port Washington | Standard | 13,682 | $79,423 | 28.6 | 4.3% |
| 53097 | Mequon | Standard | 7,683 | $135,929 | 27.2 | 38.8% |
| 53080 | Saukville | Standard | 5,059 | $80,360 | 29.2 | -7.9% |
| 53021 | Fredonia | Standard | 4,537 | $89,779 | 34.1 | -7.2% |
| 53004 | Belgium | Standard | 3,475 | $84,821 | 35.1 | 7.2% |