St. Charles County, Missouri Eviction Risk: Very Low

St. Charles County carries an average eviction-risk score of 2.3/10, placing it in the Low tier and ranking it 16th of 115 Missouri eviction laws counties by risk, meaning 15 counties are riskier and 99 are more landlord-friendly. For a county of 320,624 residents sitting on the outer edge of the St. Louis metro, that is a meaningful caution: the county is not as benign as its "Low" label suggests relative to the broad Missouri landscape. Rent averages $1,391 per month, and with a rent-burden rate of 27.7%, tenants here are spending a manageable share of income on housing, which tends to keep payment defaults lower than in higher-burden markets.

Across the county's 17 cities, risk scores span from 1.8 to 2.5, a 1.4-point range that makes city selection consequential for landlords. The renter share sits at just 21.6%, a low ownership-to-rental ratio that signals a predominantly owner-occupied market, which can limit rental supply competition but also means tenant pools are smaller. Investors who understand those city-level distinctions have a real edge when underwriting deals in Missouri.

The cities inside St. Charles County

At the top of the risk range, O'Fallon (population 93,801) and Wentzville (population 47,061) both score 2.2/10, the highest in the county. Cottleville scores 2.3/10, and the city of St. Charles, at 71,508 residents, comes in at 2.3/10. These four cities concentrate the bulk of the county's rental inventory, so a landlord operating primarily in the larger markets is, by default, operating in the higher-risk half of the county's range.

At the opposite end, Weldon Spring scores just 2.5/10, and Lake St. Louis comes in at 2.3/10, while St. Peters (population 59,092) scores 2.4/10. Risk here is genuinely hyper-local: a landlord with units in Weldon Spring and O'Fallon eviction risk is effectively operating in two different risk environments within the same county boundary. The city grid below shows the full breakdown across all 17 municipalities.

State-level laws that apply here

Under Missouri state law, specifically RSMo § 441 (Landlord and Tenant), the eviction framework is relatively direct. For nonpayment of rent, Missouri requires no advance notice before filing a rent-and-possession action under RSMo § 535.010. A material lease violation triggers a 10-day notice under RSMo § 441.060, and ending a month-to-month tenancy requires 30 days' notice under the same statute. Uncontested cases typically resolve in 21 to 45 days; contested matters extend to 45 to 120 days. The Missouri eviction process therefore moves faster than many comparable states when tenants do not contest. Total out-of-pocket costs depend on attorney involvement: court filing fees run $70 to $180, sheriff lockout fees add $40 to $150, and attorney fees range from $500 to $3,000 for those who retain counsel. Missouri eviction costs are thus variable, not fixed, and landlords who self-file can limit exposure to the lower end of those component ranges.

Missouri imposes no rent cap and requires no just cause for ending a tenancy, and state law preempts any local rent-control ordinance, meaning no city within St. Charles County can impose rent ceilings. Source-of-income is not a protected class under state law. For a full picture of tenant rights applicable across the county, Missouri security deposit limits and Missouri tenant protections are addressed in the statewide guides linked below.

With a poverty rate of 4.9% and a renter share of 21.6%, St. Charles County's rental market is relatively stable, but the 1.4-point spread between its lowest and highest-scoring cities means location within the county matters as much as the county average; use the city grid above to compare specific markets before committing capital.