Williamson County

Williamson County's numbers tell a clear story before you run a single pro forma. At a median home price of $916,175 and median rent of $2,122, the gross rent-to-price ratio sits at just 0.028, which is among the thinnest in the country. The resulting cap rate is 1.81%, and after a 20% down payment ($183,235), a 6.85% mortgage generates a monthly payment of $4,803 against estimated expenses of $743, producing negative cash flow of roughly $3,423 per month. Cash-on-cash return comes out at negative 19.49%. This is not a cash-flow market, full stop. What partially offsets those carrying costs is appreciation: home prices grew 2.86% year-over-year, and the appreciation score of 79 out of 100 reflects Williamson's positioning as one of the more consistent wealth-accumulation markets in the Southeast. The overall score of 37 and a national percentile ranking of just 2nd out of 1,000 counties make plain that this market rewards a very specific investor profile and penalizes everyone else.

The only investor Williamson makes sense for is someone buying on appreciation, has the balance sheet to carry monthly losses in the range of $3,400, and either does not need current income from the asset or is pairing this property with cash-flowing assets elsewhere. A cash-flow buyer should not be in this market at current prices and rates. A value-add operator faces the same structural problem: even if you force appreciation through renovation, you cannot renovate your way to a 5% rent-to-price ratio when the baseline is 0.028, because rents simply do not scale proportionally to home prices at this price tier. With an affordability index score of 4 out of 100 and a state rank of 77th out of 95 Tennessee counties, Williamson is pricing out renters and buyers alike, which caps rent growth organically. The investor who belongs here is not hunting yield; they are parking capital in a high-income ZIP code and accepting drag costs as the price of access.

The carry costs deserve their own line. Combined monthly property tax and insurance runs $817, using Tennessee's state-average effective property tax rate of 0.71% and an insurance rate of 0.36%. At the 0.71% rate, the tax burden is within normal range and is not itself the problem in this market, though you should verify the actual Williamson County rate, since state averages can diverge meaningfully from township-level assessments. The issue is not the tax rate; it is that $817 per month in tax and insurance sits on top of a $4,803 mortgage against $2,122 in rent, so the property requires roughly $3,478 in monthly gross rent just to cover those three line items before maintenance, management, or capex. That gap is structural and is not closed by modest rent increases.

The concentrated risk in Williamson is on the demand side. This is a high-income, low-density suburban market, and the renter pool at the price points required to approach break-even is thin. Households who can afford $3,000-plus monthly rent in Williamson typically have the balance sheet to buy, especially if prices soften. That means the investor is competing for a narrow renter cohort, and any economic disruption that pushes high-earning households toward homeownership or out of the county compresses both occupancy and achievable rents simultaneously. The population of 248,897 is growing, but population growth does not automatically translate into rental demand at the upper end of the market.

The neighbor comparison sharpens the case against Williamson for most investors. Davidson County, immediately to the north, carries a median price of $429,292, a rent-to-price ratio of 0.050 (nearly double Williamson's), and an overall score of 44. Wilson County at $492,832 and a 0.046 rent-to-price ratio scores 48. Sumner County at $436,405 and a 0.046 ratio also scores 49. Every neighboring county in this dataset delivers a meaningfully better ratio of rent to purchase price, with overall scores 7 to 12 points higher than Williamson's 37. If your objective is current income or a path to break-even cash flow, Davidson, Wilson, or Sumner all offer better entry points with Nashville-area demand dynamics supporting them. The one argument for choosing Williamson over its neighbors is if you specifically want exposure to the upper end of the Franklin and Brentwood residential corridor, believe long-term demographic trends favor continued in-migration of high-income households to that submarket, and can sustain the monthly carry cost as a cost of that positioning. For most buy-and-hold investors running a yield-oriented strategy, the neighbors are the better trade.