Warren County is a county in Missouri, United States, on the north bank of the Missouri River between St. Louis and Columbia. It had a population of 35,532 at the 2020 census and covers 438 square miles (1,130 km2) centred near 38°46′N 91°10′W.
Warrenton is the county seat and its postal code is 63383. The county has 5 incorporated cities and towns, one village, and a scattering of unincorporated communities and country crossroads. It sits in the Central time zone and is part of the St. Louis metropolitan area.
Towns & Villages in Warren County
Warren County has five incorporated cities, one incorporated village, and more than a dozen unincorporated communities and hamlets. Foristell straddles the Warren–St. Charles line, with most of its population and its post office on the St. Charles side. CDP denotes a Census-Designated Place; Unincorp. denotes an unincorporated community with no municipal government.
| Place | Type | Pop. | ZIP |
|---|---|---|---|
| Warrenton | City · seat | 8,429 | 63383 |
| Wright City | City | 3,571 | 63390 |
| Marthasville | City | 1,113 | 63357 |
| Truesdale | City | 684 | 63380 |
| Foristell | City | — | — |
| Innsbrook | Village | — | 63390 |
| Dutzow | Unincorp. | — | 63342 |
| Treloar | Unincorp. | — | 63378 |
| Truxton | Unincorp. | — | 63381 |
| Bridgeport | Unincorp. | — | — |
| Holstein | Unincorp. | — | — |
| Pendleton | Unincorp. | — | — |
| Pinckney | Unincorp. | — | — |
| Aspenhoff | Unincorp. | — | — |
| Bernheimer | Unincorp. | — | — |
| Case | Unincorp. | — | — |
| Concord Hill | Unincorp. | — | — |
| Gore | Unincorp. | — | — |
| Hopewell | Unincorp. | — | — |
| Lippstadt | Unincorp. | — | — |
| Macedonia | Unincorp. | — | — |
| Pin Oak | Unincorp. | — | — |
| Three Creeks Village | Unincorp. | — | — |
Foristell is a single municipality split across three counties — St. Charles, Warren, and Lincoln — but its city hall, post office, and most of its population sit just east of the Warren County line. Innsbrook is a gated resort village built around a private lake and golf development; it uses the Wright City ZIP for mail. Lippstadt, Macedonia, and Pin Oak survive today as named crossroads and church communities rather than settlements with defined boundaries.
ZIP Codes
- 63383 — Warrenton (county seat)
- 63390 — Wright City (also serves Innsbrook)
- 63357 — Marthasville
- 63380 — Truesdale
- 63381 — Truxton
- 63342 — Dutzow (post office boxes only)
- 63378 — Treloar (post office boxes only)
Foristell and the smaller unincorporated crossroads communities have no ZIP code of their own; mail there is delivered under a St. Charles County or neighboring Warren County post office.
Geography
Warren County lies in the rolling hill country of Missouri’s lower Missouri River valley, on the north bank of the river across from the Missouri Rhineland wine country. The Missouri River forms the county’s southern border. Terrain rises from the river bottoms into wooded uplands and pasture across the county’s northern two-thirds, and Route 94 through the river towns is nicknamed the “Missouri Weinstrasse” for its cluster of vineyards.
Warren County borders Lincoln County to the north, St. Charles County to the east, Franklin County across the river to the south, Gasconade County to the southwest, and Montgomery County to the west.
Demographics
Warren County had 35,532 residents at the 2020 census. Warrenton, the county seat, is the largest community with 8,429 people, followed by Wright City at 3,571. About one-quarter of county residents live in incorporated cities and towns; the rest live in rural areas and unincorporated communities. Median household income runs below the Missouri median of $68,545, though the gap has narrowed as St. Louis-area commuters have moved into the eastern part of the county along Interstate 70.
Economy & Local Life
The Warren County R-III School District, based in Warrenton, is the county’s largest employer. SAF-Holland, a truck and trailer components manufacturer, operates a plant in Warrenton, and Child Evangelism Fellowship has its national headquarters there. Agriculture and viticulture remain important along the river bottoms, where several wineries operate near Dutzow and Marthasville on the Missouri Weinstrasse. Innsbrook’s resort and golf community draws seasonal visitors from the St. Louis area.
History
Warren County was organized on January 5, 1833, from territory taken out of Montgomery County. It was named for General Joseph Warren, a Massachusetts physician and militia officer killed at the Battle of Bunker Hill in 1775. German immigrants settled the river towns of Dutzow, Marthasville, and Holstein in the 1830s and 1840s, planting the vineyards that still define the area, and Marthasville is recognized as one of the earliest German settlements in Missouri.
Getting There
Interstate 70 crosses the county west to east through Wright City and Warrenton, and U.S. Route 40 and Missouri Routes 47 and 94 provide the other main roads.
- St. Louis — 55 miles east
- Columbia — 75 miles west
- St. Charles — 30 miles east
- Jefferson City — 85 miles southwest
The nearest commercial airport is St. Louis Lambert International Airport, about an hour’s drive east via I-70.
Frequently Asked Questions
Where is Warren County, Missouri?
It is in east-central Missouri, on the north bank of the Missouri River between St. Louis and Columbia, along the Interstate 70 corridor.
What is the population of Warren County?
35,532 people, according to the 2020 census.
How big is Warren County?
438 square miles (1,130 km2), of which about 9.2 square miles is water.
What is the county seat of Warren County?
Warrenton is the county seat.
How many towns are in Warren County?
Five incorporated cities — Warrenton, Wright City, Marthasville, Truesdale, and Foristell — plus the village of Innsbrook and more than a dozen unincorporated communities.
What ZIP codes are in Warren County?
63383 (Warrenton), 63390 (Wright City), 63357 (Marthasville), 63380 (Truesdale), 63381 (Truxton), 63342 (Dutzow), and 63378 (Treloar).
Why is Route 94 called the Missouri Weinstrasse?
German settlers planted vineyards along the Missouri River bottoms near Dutzow and Marthasville starting in the 1830s, and the tradition continues at wineries along that stretch of Route 94 today.
More counties in this state: Towns and villages in Missouri.