Warren County

Warren County's gross rent-to-price ratio sits at 0.578% monthly, or roughly 6.9% annualized, which sounds workable until you run the full stack. At a $417,688 purchase price with 20% down, the modeled cap rate is 3.76% and the cash-on-cash return is negative 11.02%, driven by a $2,190 monthly mortgage at 6.85% against $2,012 in median rent. That math produces an estimated negative $882 per month before reserves. The appreciation score of 67 outpaces the cash-flow score of 57, and year-over-year home price growth of 1.7% is modest in absolute terms but positions Warren squarely in the appreciation-leaning tier of the market spectrum. This is not a market where the rent check covers the note; it is a market where you are betting on price compounding over time while absorbing carry.

Who does Warren suit? Not a cash-flow buyer running standard leverage at today's rates. The numbers simply do not support it: negative $882 monthly on a financed deal is a significant bleed, and the cash-on-cash at negative 11.02% means every dollar of equity is losing ground on a current-income basis. An appreciation buyer with a long hold horizon and the ability to carry losses, or a high-equity buyer who significantly reduces the mortgage load, has more of a case. The affordability index of 40 and affordability score of 40 confirm that Warren is not a low-barrier entry market, which limits the tenant pool at the upper price points and compresses value-add upside unless an operator is buying well below the $417,688 median. Warren's overall score of 54 and stability score of 50 suggest a middle-of-the-road market, not a conviction buy at full price with full leverage.

The tax and insurance picture is the single most important underwriting line item in Warren County and deserves serious attention before you model any deal. The state-average effective property tax rate for New Jersey is 2.49%, which produces an estimated $10,400 in annual property taxes on a median-priced asset, and combined with $877 in annual insurance, the total tax-and-insurance carry is approximately $940 per month. That figure alone nearly matches the median rent in many single-family markets; here, it represents 47% of the $2,012 median rent before mortgage, maintenance, vacancy, or management. The propertyTaxFlag is flagged "very_high," and that designation is fully earned. At 2.49%, the state-average rate is high enough to warrant its own line on every underwrite you build here, and the honest caveat from the source data applies: this is a state-average estimate based on Tax Foundation 2024 data, and actual county and township rates in Warren may differ materially, so pull the municipal assessor data before you close.

Comparing Warren to its neighbors clarifies where it sits in the regional hierarchy. Morris County's median home price is $677,872 with a rent-to-price ratio of 0.502% monthly and an overall score of 55, marginally better than Warren's 54 but at 62% higher prices. Somerset County at $640,205 and Hunterdon at $614,687 both carry rent-to-price ratios below Warren's 0.578%, meaning Warren actually produces better relative rent yield than any of the five neighbors listed. Bergen County at $735,505 is the most expensive neighbor with the worst rent-to-price at 0.453% monthly and the lowest overall score at 52. Union County at $614,241 produces 0.506% monthly and scores 51. On rent yield alone, Warren is the most favorable of the six counties in this comparison set, which matters at the margin for any investor who is already underweighting New Jersey due to its tax environment. You choose Warren over a neighbor when entry price discipline is a priority, when you believe relative value at $417,688 versus $614,000 to $735,000 will compress over time, and when you can carry the negative monthly cash flow without relying on rent to service the debt. You avoid it if you need current income, if you cannot absorb a 2.49% tax rate in your operating model, or if your hold period is short enough that 1.7% annual appreciation does not compound into a meaningful exit gain.

The population of 109,739 makes Warren a smaller county by New Jersey standards, which introduces concentration risk that a purely numerical model will not capture. A thinner rental market means individual vacancies hit occupancy rates harder, and a localized economic disruption, a single large employer reducing headcount, an infrastructure shift, has an outsized effect relative to a larger metropolitan county. The stability score of 50 reflects this: not distressed, but not insulated either. Investors who prefer depth of rental demand and tenant diversity should weigh whether Warren's relative price advantage over neighbors compensates for that thinner market structure.