Last updated October 22, 2026
A Fenton address can mean three different places: the City of Fenton, unincorporated St. Louis County or unincorporated Jefferson County. In 2026 sales, being inside or outside the city barely changed the tax rate. Crossing into Jefferson County did: the median bill there ran about 0.87% of the sale price, versus about 1.1% on the St. Louis County side.
All three share the 63026 ZIP code, so the address alone won’t tell you which one a house is in. Check the exact address with the county before you compare taxes or rules.
Short answers first, from 111 closed single-family sales with a Fenton mailing address in 2026: 13 inside the City of Fenton, 47 in unincorporated St. Louis County and 51 in Jefferson County. Only 13 sales were inside the city, so treat that group as an example. These are past sales, not what’s for sale today.
Not by much. As a share of the sale price, the median 2026 tax bill was about 1.08% inside the City of Fenton and 1.12% in unincorporated St. Louis County. Within the same school district the rates were close: in Rockwood, 1.09% inside the city (2 sales) and 1.12% outside (43); in Lindbergh, 1.08% (11) and 1.06% (4). The median city bill was lower, $3,524 versus $4,071, because the city’s houses sold for less.
Yes. The median 2026 bill on a Fenton-address home in Jefferson County was $3,088, about 0.87% of the sale price, versus about 1.1% on the St. Louis County side. The school district mattered there too: about 1.00% of price in Fox C-6 ($4,012 median) and 0.66% in Northwest R-I ($1,790).
In 2026, the median was $327,000 inside the City of Fenton, $360,000 in unincorporated St. Louis County and $350,500 on the Jefferson County side. The city’s homes were the oldest, built at a median 1963, against 1983 and 2003.
At $350,000 or less, a 2026 budget reached 7 of 13 sales inside the City of Fenton, 21 of 47 in unincorporated St. Louis County (44.7%) and 25 of 51 in Jefferson County (49.0%). At $400,000 or less: 8 of 13, 26 (55.3%) and 36 (70.6%).
The Jefferson County side. Its median 2026 sale was built in 2003, and 37 of 51 (72.5%) were built in 1990 or later. Unincorporated St. Louis County’s median was 1983. Inside the City of Fenton it was 1963, and 7 of 13 were built before 1970.
The St. Louis County side. The median days on market (CDOM) was 4 both inside the City of Fenton and in unincorporated St. Louis County, and 9 in Jefferson County. 29 of 47 unincorporated St. Louis County sales (61.7%) closed above the original list price, versus 20 of 51 in Jefferson County (39.2%).
| City of Fenton | Uninc. St. Louis Co. | Jefferson Co. | |
|---|---|---|---|
| Sales | 13 | 47 | 51 |
| Median price | $327,000 | $360,000 | $350,500 |
| Median year built | 1963 | 1983 | 2003 |
| Median days on market | 4 | 4 | 9 |
| Above original list | 7 of 13 | 29 (61.7%) | 20 (39.2%) |
| Median tax bill | $3,524 | $4,071 | $3,088 |
| Tax as % of price | 1.08% | 1.12% | 0.87% |
Inside or outside the city, the St. Louis County side ran about 1.1% of the sale price. The bigger tax differences came from the county line and the school district.
| Part of Fenton, district (sales with a tax bill) | Median bill | % of price |
|---|---|---|
| City of Fenton, Lindbergh (11) | $2,976 | 1.08% |
| City of Fenton, Rockwood (2) | $5,738 | 1.09% |
| Uninc. St. Louis Co., Rockwood (43) | $3,970 | 1.12% |
| Uninc. St. Louis Co., Lindbergh (4) | $5,500 | 1.06% |
| Jefferson Co., Fox C-6 (32) | $4,012 | 1.00% |
| Jefferson Co., Northwest R-I (18) | $1,790 | 0.66% |
These come from the confirmed tax bill on each 2026 sale, the same bill the closing prorations are figured on, divided by the sale price. Several groups are tiny, so read them as examples. Your bill can change after you buy, because Missouri counties reassess property in odd-numbered years. Confirm the exact address with the St. Louis County or Jefferson County Collector of Revenue before you make an offer.
| Budget | City of Fenton (13) | Uninc. St. Louis Co. (47) | Jefferson Co. (51) |
|---|---|---|---|
| $300,000 | 6 of 13 | 9 (19.1%) | 14 (27.5%) |
| $350,000 | 7 of 13 | 21 (44.7%) | 25 (49.0%) |
| $400,000 | 8 of 13 | 26 (55.3%) | 36 (70.6%) |
| $500,000 | 9 of 13 | 36 (76.6%) | 49 (96.1%) |
From $400,000 up, the Jefferson County side put the most of its market in reach, and for newer houses.
| Year built | City of Fenton (13) | Uninc. St. Louis Co. (47) | Jefferson Co. (51) |
|---|---|---|---|
| Before 1970 | 7 | 13 (27.7%) | 6 (11.8%) |
| 1970–1989 | 2 | 21 (44.7%) | 8 (15.7%) |
| 1990–2009 | 4 | 13 (27.7%) | 21 (41.2%) |
| 2010 or later | 0 | 0 | 16 (31.4%) |
I recommend a sewer scope on every St. Louis-area home, whatever its age.
Inside the City of Fenton, 11 of 13 sales were in Lindbergh and 2 in Rockwood R-VI. In unincorporated St. Louis County, 43 of 47 were in Rockwood and 4 in Lindbergh. On the Jefferson County side, 32 were in Fox C-6 and 19 in Northwest R-I. Confirm the district for the exact address. Lessons From a Sale: right-sizing to the Jefferson County side of Fenton →
Is my Fenton address inside the City of Fenton?
Often not. Of the 60 Fenton-address sales on the St. Louis County side in 2026, 13 were inside the City of Fenton and 47 were outside it, according to the Census Bureau’s 2024 boundary. All 51 on the Jefferson County side were outside any city limits. The Jefferson County side →
What does a three-bedroom house cost in each part of Fenton?
In 2026 sales, the median three-bedroom home sold for $325,000 in unincorporated St. Louis County (25 sales) and $317,500 on the Jefferson County side (30 sales). Inside the City of Fenton, the 6 three-bedroom sales had a $265,000 median.
Do I need an occupancy permit when I buy in Fenton?
It depends on which Fenton. Inside the City of Fenton, there’s no general occupancy permit for the resale of an existing home. Unincorporated St. Louis County requires an occupancy permit when a new occupant moves in. Jefferson County has no resale inspection of its own. Confirm the current rule before you close. City of Fenton rules →
This is one piece of the St. Louis home buying process. See how it all fits together:
📚 Complete St. Louis Buyer Guide →
Grew up in South St. Louis, lived in Dogtown for 6 years, now in South County. You'll find us at Wellspring on Lindbergh on Sundays. I'm not selling you a house — I'm showing you how to think about buying or selling a house.