Oakville is a St. Louis County suburb sitting roughly 17 miles south of Downtown St. Louis. Commuters usually make the drive in about 25 minutes, which puts it squarely inside the Greater St. Louis metropolitan area without being swallowed by it. Anyone buying a home in Oakville will find a fast-paced local market with limited available homes.
As of mid-2026, the median home sale price in Oakville hovers around $357,000. Properties sell in roughly 12 days on average, often going for about 102% of their list price. Knowing the local postal boundaries helps you figure out where to search and how to read the data on different parts of this unincorporated community.
The Primary Zip Code for Oakville, MO
The entire Oakville community operates under a single postal code: 63129. Unlike larger incorporated cities that span multiple delivery zones, this area consolidates its residential and commercial addresses into one identifier - which does simplify the home search process for buyers coming into south St. Louis County.
Because Oakville is an unincorporated community rather than a municipality with its own city government, the 63129 zip code serves as a primary geographic marker for the area. Most mapping tools and real estate platforms use this number to draw the boundaries for local housing data and property tax estimates.
How the 63129 Area Operates
While some buyers ask how many zip codes cover the area, 63129 is the only one you need for an Oakville address. The United States Postal Service routes all mail for this suburb through this single code.
When searching for properties online, typing in 63129 captures the full extent of the Oakville market. That includes the residential subdivisions branching off the main thoroughfares and the commercial shopping centers concentrated along Telegraph Road.
Oakville Boundaries and Map Areas
Oakville sits bordered by the Mississippi River to the east and south. On hyper-local mapping sites, the community shares edges with neighboring sections like Oakbriar Meadows. Because it's an unincorporated area, it functions as one cohesive suburban community rather than a collection of distinct, named sub-neighborhoods.
Buyers reviewing a boundary map will notice that the 63129 footprint covers a substantial amount of green space alongside its residential developments. The local geography dictates where homes are built, with many properties positioned near river access and county parkland.
Sub-Areas and Local Landmarks
The 63129 zip code contains several designated St. Louis County Landmarks. Cliff Cave County Park anchors the area with the second-longest natural cave in the county, plus hiking, biking, equestrian trails, and fishing access along the Mississippi River.
Further along the water, Bee Tree County Park spans 192 acres, featuring a fishing lake and the historic Nims Mansion - a 1929 Tudor Revival estate built for Southwestern Bell Telephone founder Eugene Nims. Other historic structures within the zip code include the Fassen-Eiler Farmhouse, built in 1857, and the 1878 St. Paul's Parsonage.
County Lines and Metro Connections
Oakville is located entirely within St. Louis County, Missouri - not the independent City of St. Louis, and not any neighboring county. Buyers relocating from outside the region should know that St. Louis County and St. Louis City operate as separate entities with different tax structures and municipal services. It's a distinction that catches a lot of newcomers off guard.
The community is served by the Mehlville R-IX School District. School zoning tends to follow postal boundaries, but you should always verify a specific property address directly with the district to confirm school assignments.
Finding Full 9-Digit Zip Codes
For precise mail delivery and utility setup, residents use a ZIP+4 code. The base 63129 code directs mail to the local post office, while the final four digits identify a specific street segment, apartment building, or even a single side of a road.
You can find the exact 9-digit zip code for any Oakville property by entering the street address into the USPS lookup tool online. Title companies and mortgage lenders typically require this full nine-digit format on closing documents and loan applications.
Real Estate Activity in the 63129 Zip Code
The housing market inside the Oakville zip code moves quickly. In recent months, local inventory dropped to just 36 available homes, creating roughly a 0.9-month supply. That's a thin cushion, and it means you should act decisively when a property matching your criteria hits the market.
During this same period, 119 homes successfully closed. The median sale price sits at approximately $357,000, representing a 2.8% increase year-over-year.
Home Values and Market Speed
Homes in the 63129 zip code routinely sell above asking. Recent data shows the average sale-to-list ratio is around 102%, with more than half of all homes selling above list price. Properties spend roughly 12 days on the market before going under contract.
Get your financing squared away before you start touring. Competition here is real, particularly for homes near Telegraph Road amenities or the county parks.
Frequently Asked Questions
What zip codes officially cover the Oakville, MO real estate market?
The entire Oakville community is covered by a single zip code: 63129. There are no secondary or overlapping postal codes for residential addresses within the Oakville boundaries.
Does the 63129 zip code include Mehlville, or is it strictly Oakville?
The 63129 zip code primarily serves Oakville, though postal boundaries and community names in unincorporated St. Louis County can sometimes blur. Both areas are served by the Mehlville R-IX School District, and residents often use the commercial corridors that connect the two.
Are all homes in the Oakville zip code guaranteed to be in the Mehlville School District?
Yes, Oakville is served by the Mehlville R-IX School District. That said, buyers should always confirm exact boundary lines with the district, as zoning can change based on specific street addresses.
How do property taxes in Oakville's 63129 zip code compare to incorporated St. Louis County municipalities?
Because Oakville is an unincorporated community in St. Louis County, residents do not pay additional city-level municipal taxes. You will still pay St. Louis County taxes and levies for the Mehlville R-IX School District.
Which neighborhoods within the Oakville, MO zip code currently have the highest home values?
Oakville functions as a single cohesive community rather than a collection of distinct sub-neighborhoods. Homes situated near the Mississippi River or adjacent to Cliff Cave County Park and Bee Tree County Park often command higher prices due to their location and lot sizes.
Will my mailing address say Oakville or St. Louis if I buy a house in 63129?
The USPS recognizes both Oakville and St. Louis as acceptable city names for the 63129 zip code. Because Oakville is part of the Greater St. Louis metropolitan area and sits within St. Louis County, many automated systems will default to St. Louis.
