Warren County

Warren County sits at a median home price of $114,979, making it one of the more affordable entry points in Illinois. The affordability index scores a perfect 100, and the national percentile rank of 65 out of 1,000 counties puts it in the upper third broadly, but the cash-flow score of 0 is the number that demands attention before anything else. Cap rate and cash-on-cash return both come back at zero in the model, which means the current rent-to-price relationship, at least as the data captures it, does not pencil to a positive return after standard expenses. Home prices dipped 0.46% year-over-year, so there is no appreciation momentum to offset the income side. The appreciation score of 48 confirms this is not a market where you are buying price growth either. What you have is a county that is cheap to enter but offers neither a reliable cash-flow margin nor a credible appreciation thesis at this moment.

Given those scores, the investor Warren County suits most is a value-add operator who can manufacture yield that the market does not naturally deliver, or a buyer who already owns neighboring assets and is adding a low-cost position for portfolio diversification rather than return optimization. A pure cash-flow buyer needs to see rent-to-price ratios materially above the breakeven threshold before the numbers work, and with the cash-flow score at zero that threshold is not being cleared on stabilized assets here. An appreciation buyer has a 48 score and a slightly negative price trend to reckon with, which is not the profile of a market you underwrite for exit premium. The $114,979 median price is genuinely low, which means a renovated property that commands a rent premium over the local baseline could shift the math, but that is a project-specific story, not a market-level thesis.

No economic anchors or employer data were provided for Warren County, so this analysis cannot speak to the composition of local demand drivers, job concentration, or institutional employment stability. That gap is itself a flag for due diligence: in a county of 16,760 people, understanding who is renting and why they are staying is not optional. Population at that scale means the tenant pool is thin, and a single employer contraction or demographic shift registers immediately in vacancy and rent softness. Investors who have not spent time on the ground in Monmouth or talked to local property managers are underwriting blind on the demand side.

The tax and insurance picture is a serious underwriting problem here. Illinois carries a state-average effective property tax rate of 2.27%, flagged as very high, and at a $114,979 purchase price that translates to $2,610 in annual property taxes alone. Combined with $310 in annual insurance, you are looking at $243 per month in tax and insurance carry before you factor in mortgage, maintenance, or vacancy. On a property at this price point, $243 monthly in tax and insurance as a percentage of gross rent is punishing. If the market rent on a median-priced home is in the range where cash flow is already zeroed out, this $243 figure is likely one of the primary reasons why. The 2.27% is a state-average estimate per Tax Foundation 2024 data, and county and township rates in Warren may differ, but Illinois jurisdictions rarely come in materially below the state average. Any underwrite that does not model this line explicitly will produce a return that does not survive contact with an actual tax bill.

The population of 16,760 is the concentration risk that runs through every other variable. A small market with no named economic anchors, a negative price trend, and a zero cash-flow score has limited margin for error. Regulatory risk in Illinois is real at the state level, with landlord-tenant law that generally favors tenants and eviction timelines that can extend carrying costs significantly, though local enforcement varies. No vacancy or demographic migration data was provided, so those specific risks cannot be quantified here, but in a county this size, any trend toward population decline, which is common across rural western Illinois, compounds the rent ceiling problem over time.

Compared to the neighboring counties in the data, Warren's position is mixed. Adams County carries a higher overall score of 68, a median home price of $174,680, and a rent-to-price ratio of 6.74%, which is a meaningfully better income yield profile than Warren's current numbers suggest. An investor choosing between the two should weight Adams County's higher rent-to-price ratio seriously; the additional $60,000 in entry cost buys a market where the income math at least closes. Greene County scores 65 at a $106,001 median, slightly cheaper than Warren but similarly thin on data. Bond County at 67 and $154,738 is another market with a better overall score than Warren at a moderate price step-up. DuPage County at $416,478 and a rent-to-price of 5.88% operates in an entirely different market segment and is not a realistic comparison for an investor targeting Warren-level price points. The one case where Warren makes sense over its neighbors is a capital-constrained buyer who needs the lowest possible acquisition cost and has the operational capacity to execute a value-add play that its neighbors, at higher prices, would not accommodate at the same basis.