| ZIP Codes: | 54 ZIP Codes (33 Standard, 6 PO Box, 15 Unique) [See All] |
| Area Codes: | 353 / 608 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:14:18 PM |
| Population: | 571,119 [See All] |
| FIPS: | 55025 |
| CBSA: | Madison, WI |
| Land Area: | 1,191 sq mi |
| Water Area: | 18 sq mi |
| Coordinates: | 43.0894, -89.3838 |
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571,119 residents live across 54 ZIPs covering 1,191 sq mi, served by 22 distinct USPS-recognized cities.
Population moved from 501,832 to 571,119 from 2014 to 2024 — a +13.8% change. 28 ZIPs gained residents, 6 lost (and 1 held flat).
The county's wealthiest ZIP 53593 (Verona, $135,023 median) and poorest ZIP 53706 (Madison, $6,053) are 10.6 miles apart — a 22.3× income gap across local geography.
Median home values vary 2.5× across this county — from $255,600 in 53713 (Madison) to $647,300 in 53726 (Madison).
Density varies 515× across the county — from 40 people/sq mi in 53517 (Blue Mounds) to 20,496 in 53703 (Madison).
Educational attainment ranges from 26.2% bachelor's+ in 53559 (Marshall) to 85.7% in 53726 (Madison) — the breadth of educational profiles across the area.
Within Wisconsin, this is the #2 most populous of 73 counties and ranks #5 for median household income with the #1 fastest decade growth .
Hosts 4 single-entity Unique ZIPs: 53777American Family Ins Co ; 53792Univ Of Wis Hosp Hlth Sc Ctr ; 53788Madison Gas And Electric ; and 53784Electronic Data Systems .
Weighted by population, the typical household earns about $91,760 across the county — reflecting what a typical resident sees, not a simple ZIP average.
55.5% of adults age 25+ hold a bachelor's degree or higher (211,299 of 380,910 reporting). The most-educated ZIPs cluster around Madison.
33 Standard delivery, 6 PO Box only, 15 single-entity Unique ZIPs serve this county.
9 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
15 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 22.3× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 53711 | Madison | Standard | 51,279 | $100,735 | 29.1 | 12.5% |
| 53704 | Madison | Standard | 46,730 | $74,034 | 27.8 | 5.7% |
| 53590 | Sun Prairie | Standard | 45,602 | $97,051 | 66.0 | 21.8% |
| 53703 | Madison | Standard | 37,659 | $47,847 | 1.8 | 33.3% |
| 53719 | Madison | Standard | 34,115 | $92,052 | 10.1 | 14.2% |
| 53593 | Verona | Standard | 31,081 | $135,023 | 74.3 | 48.0% |
| 53562 | Middleton | Standard | 29,790 | $101,381 | 31.3 | 21.1% |
| 53705 | Madison | Standard | 25,017 | $88,549 | 17.1 | 5.7% |
| 53713 | Madison | Standard | 24,351 | $58,017 | 9.3 | 1.1% |
| 53597 | Waunakee | Standard | 21,426 | $117,000 | 58.5 | 25.0% |
| 53589 | Stoughton | Standard | 19,550 | $96,226 | 90.6 | -1.6% |
| 53718 | Madison | Standard | 18,989 | $102,843 | 20.2 | 53.9% |
| 53716 | Madison | Standard | 18,596 | $91,716 | 6.7 | 1.4% |
| 53575 | Oregon | Standard | 18,204 | $107,885 | 57.1 | 15.1% |
| 53532 | Deforest | Standard | 16,514 | $110,022 | 54.0 | 16.7% |
| 53714 | Madison | Standard | 16,169 | $71,519 | 4.5 | -0.6% |
| 53715 | Madison | Standard | 15,974 | $38,996 | 1.7 | 16.1% |
| 53558 | Mcfarland | Standard | 13,164 | $107,609 | 19.8 | 19.3% |
| 53717 | Madison | Standard | 13,052 | $98,180 | 3.5 | 8.8% |
| 53527 | Cottage Grove | Standard | 11,924 | $133,883 | 36.1 | 9.6% |
| 53572 | Mount Horeb | Standard | 10,385 | $108,750 | 103.3 | 3.3% |
| 53528 | Cross Plains | Standard | 6,263 | $106,823 | 44.6 | 8.4% |
| 53559 | Marshall | Standard | 6,110 | $93,571 | 68.8 | 1.1% |
| 53508 | Belleville | Standard | 5,654 | $99,948 | 71.4 | 1.8% |
| 53523 | Cambridge | Standard | 5,074 | $102,188 | 52.1 | 4.9% |
| 53726 | Madison | Standard | 5,043 | $47,754 | 0.5 | -17.2% |
| 53531 | Deerfield | Standard | 4,430 | $105,000 | 41.4 | -0.2% |
| 53598 | Windsor | Standard | 4,176 | $106,476 | 3.5 | 65.7% |
| 53706 | Madison | Standard | 3,958 | $6,053 | 0.4 | -35.8% |
| 53560 | Mazomanie | Standard | 3,416 | $98,409 | 63.5 | -2.7% |
| 53515 | Black Earth | Standard | 2,647 | $92,625 | 38.9 | 15.2% |
| 53529 | Dane | Standard | 2,611 | $107,560 | 37.3 | 15.5% |
| 53517 | Blue Mounds | Standard | 1,799 | $84,722 | 45.2 | 1.1% |
| 53571 | Morrisonville | PO Box | 367 | $65,729 | 0.4 | 61.7% |
| 53792 | Madison | Unique | 0 | — | 0.0 | — |
| 53788 | Madison | Unique | — | — | 0.0 | — |
| 53784 | Madison | Unique | — | — | 0.0 | — |
| 53702 | Madison | Unique | — | — | 0.0 | — |
| 53774 | Madison | Unique | — | — | 0.0 | — |
| 53782 | Madison | Unique | — | — | 0.0 | — |
| 53790 | Madison | Unique | — | — | 0.0 | — |
| 53791 | Madison | Unique | — | — | 0.0 | — |
| 53786 | Madison | Unique | — | — | 0.0 | — |
| 53794 | Madison | Unique | — | — | 0.0 | — |
| 53793 | Madison | Unique | — | — | 0.0 | — |
| 53785 | Madison | Unique | — | — | 0.0 | — |
| 53707 | Madison | PO Box | — | — | 0.0 | — |
| 53708 | Madison | PO Box | — | — | 0.0 | — |
| 53744 | Madison | PO Box | — | — | 0.0 | — |
| 53725 | Madison | PO Box | — | — | 0.0 | — |
| 53701 | Madison | PO Box | — | — | 0.0 | — |
| 53596 | Sun Prairie | Unique | — | — | 0.0 | — |
| 53777 | Madison | Unique | — | — | 0.6 | — |
| 53783 | Madison | Unique | — | — | 0.0 | — |