Wyandotte County is a county in Kansas, United States, directly across the state line from downtown Kansas City, Missouri, at the confluence of the Kansas and Missouri rivers. It had a population of 169,245 at the 2020 census, an estimated 170,597 by 2025, and covers 152 square miles (390 km2) of land centred near 39°07′N 94°43′W.
Kansas City is the county seat and has shared a single consolidated government with the county since 1997; its postal code is 66101. The county also holds two independently incorporated cities, Bonner Springs and Edwardsville, plus a dozen recognized neighborhoods and unincorporated communities inside Kansas City’s own boundaries, and it runs on Central Time.
Towns & Villages in Wyandotte County
Wyandotte County has 16 named places on record: one consolidated city-county government (Kansas City), two independently incorporated cities that also reach into neighboring counties, and thirteen recognized neighborhoods and unincorporated communities with no city government of their own, all inside Kansas City’s boundaries. Neighborhood covers a named district of the consolidated city; Unincorp. covers a smaller community with no formal boundary of its own.
| Place | Type | Pop. | ZIP |
|---|---|---|---|
| Kansas City | Consolidated city · seat | 156,607 | 66101–66119 |
| Bonner Springs | City | 7,837 | 66012 |
| Edwardsville | City | 4,717 | 66111 |
| Lake Quivira | City · partial | — | — |
| Argentine | Neighborhood | — | — |
| Armourdale | Neighborhood | — | — |
| Fairfax | Neighborhood | — | — |
| Turner | Neighborhood | — | — |
| Rosedale | Neighborhood | — | — |
| Grandview | Neighborhood | — | — |
| Muncie | Neighborhood | — | — |
| Strawberry Hill | Neighborhood | — | 66101 |
| Piper | Unincorp. | — | — |
| Armstrong | Unincorp. | — | — |
| Riverview | Unincorp. | — | — |
| Pomeroy | Unincorp. | — | — |
Two places on this list are only partly inside Wyandotte County. Bonner Springs’s 7,837 residents are counted citywide; most of the city sits in Wyandotte, but its limits also reach into Leavenworth and Johnson counties. Lake Quivira, a small private lake community, has most of its area and population in Johnson County, with only a sliver crossing into Wyandotte — its residents there use a Johnson County post office, not one of Kansas City’s ZIP codes.
ZIP Codes
- 66012 — Bonner Springs
- 66111 — Edwardsville
- 66113 — Edwardsville (also covers a rural stretch of the city)
- 66101 — Kansas City (downtown and Strawberry Hill)
Kansas City itself carries nineteen ZIP codes in all, 66101 through 66113 and 66115 and 66117 through 66119, assigned neighborhood by neighborhood rather than from one central post office; Argentine, Armourdale, Fairfax, Muncie, Rosedale and Turner each fall under a different code inside that range. The smaller unincorporated communities — Piper, Armstrong, Riverview and Pomeroy — have no ZIP code of their own and are served by whichever Kansas City post office is nearest.
Geography
Wyandotte County is Kansas’s smallest county by area, sitting where the Kansas River (locally called the Kaw) flows into the Missouri River. Of its roughly 156.6 square miles, about 152 are land and 4.6 are water, close to 3 percent — high for a Kansas county, driven by the two rivers and their floodplains rather than any natural lake. Bluffs above the Missouri River carry much of the county’s older housing stock, while the Kansas River valley holds its industrial districts, including Fairfax and Armourdale.
Leavenworth County lies to the west, Johnson County to the south, and three Missouri counties border the county across the state line: Platte County to the north, Clay County to the northeast, and Jackson County, home to Kansas City, Missouri, to the east. Leavenworth County and Johnson County both have posts on this site; Platte County does not. Clay County and Jackson County across the state line are also covered here.
Demographics
Wyandotte County had a population of 169,245 at the 2020 census, and a 2025 estimate puts the county near 170,597, making it the fourth most populous county in Kansas. Kansas City accounts for the overwhelming majority of that total, with Bonner Springs and Edwardsville together adding fewer than 13,000 residents. The county’s population is 43.6 percent white, 33.0 percent Hispanic or Latino, 20.4 percent Black or African American and 4.6 percent Asian, with a median age of 34.5, younger than the state as a whole. Median household income runs $63,631 (2024), well below the Kansas statewide figure of $70,333 (2023 ACS). Population density works out to roughly 1,087 people per square mile of land, by far the highest of any Kansas county.
Economy & Local Life
Manufacturing employs the most workers in the county, about 9,838 people, followed by retail trade at 9,708 and health care and social assistance at 8,971. The University of Kansas Health System, headquartered in Kansas City, employs more than 8,500 people and anchors the county’s health care sector alongside the University of Kansas Medical Center. General Motors runs its Fairfax Assembly Plant in the Fairfax industrial district, building the Chevrolet Malibu and Cadillac XT4; Amazon and UPS both operate large logistics facilities in the county. Village West, at the interchange of Interstate 70 and Interstate 435, brings together the Kansas Speedway, Hollywood Casino, Legends Outlets Kansas City, Great Wolf Lodge and Children’s Mercy Park, home to Major League Soccer’s Sporting Kansas City and the Kansas City Current of the National Women’s Soccer League. Bonner Springs hosts the annual Kansas City Renaissance Festival, drawing about 180,000 visitors over sixteen operating days each fall, and the Azura Amphitheater, a roughly 18,000-seat outdoor concert venue.
History
Kansas Territory organized Wyandotte County on January 29, 1859, two years before Kansas became a state. It takes its name from the Wyandot people, called the Huron by French traders in Canada, who were forced from Ohio and settled at the confluence of the Kansas and Missouri rivers starting in 1843. The Huron Indian Cemetery, also called the Wyandot National Burying Ground, holds their dead at North 7th Street Trafficway and Minnesota Avenue in downtown Kansas City; it became a National Historic Landmark on December 23, 2016, after more than a century of legal battles to keep it from being redeveloped. In 1997, county voters approved consolidating the county government with the city of Kansas City into the Unified Government of Wyandotte County and Kansas City, Kansas, one of only a handful of true city-county consolidations in the United States.
Getting There
Interstate 70 crosses the county through downtown Kansas City and Village West, and Interstate 435 forms part of the Kansas City metro’s outer loop through the county’s south side. Interstate 635, also called the Lewis and Clark Viaduct corridor, runs north from I-35 in Johnson County through Kansas City, crosses the Kansas River, meets I-70, and continues to an interchange with K-5 near the Missouri River before crossing into Missouri.
- Downtown Kansas City, Missouri — directly across the state line
- Overland Park — about 15 miles south
- Leavenworth — about 15 miles northwest
- Lawrence — about 35 miles west
Kansas City International Airport, in Platte County, Missouri, is about 15 miles northwest of downtown Kansas City, Missouri and serves the whole metro area, including Wyandotte County. Kansas City Union Station, just across the state line in Missouri, is the region’s Amtrak stop, serving the Southwest Chief and Missouri River Runner lines.
Frequently Asked Questions
Where is Wyandotte County located?
It sits in Kansas’s far northeastern corner, directly across the state line from downtown Kansas City, Missouri, at the confluence of the Kansas and Missouri rivers.
What is the population of Wyandotte County?
169,245 at the 2020 census, with a 2025 estimate near 170,597, making it Kansas’s fourth most populous county.
How big is Wyandotte County?
152 square miles (390 km2) of land plus 4.6 square miles of water, making it the smallest county in Kansas by area.
What is the county seat of Wyandotte County?
Kansas City, which has shared a single consolidated government with the county since 1997.
How many cities are in Wyandotte County?
Kansas City is consolidated with the county government; Bonner Springs and Edwardsville are independently incorporated cities, and a small part of Lake Quivira also crosses into the county.
What ZIP codes does Wyandotte County use?
66101 through 66119 for Kansas City, 66012 for Bonner Springs, and 66111 and 66113 for Edwardsville.
What is Wyandotte County known for?
The 1997 Unified Government consolidation, the Huron Indian Cemetery, Village West’s Kansas Speedway and Legends Outlets, and General Motors’ Fairfax Assembly Plant.
More counties in this state: Towns and villages in Kansas.