Sully County is a valuation-and-verification case, not a demonstrated income case: investors able to obtain property-level rent and flood evidence should investigate, while those relying on county averages should be cautious. The supplied Zillow county median home value is $286,338, down 1.76% year over year. That decline is a home-value observation, not a closed-sale comp or a rent signal, and the record offers no FHFA repeat-transaction HPI to corroborate or challenge its direction.
Market asking rent is not published, so gross yield cannot be computed from the home value. HUD's two-bedroom FMR of $948 per month is a payment standard, not an estimate of market rent and cannot substitute in the yield calculation. The effective property-tax rate is 0.84%, with median annual tax of $1,715. Inland flood is the dominant hazard; the modeled climate-loss ratio is 0.18% of building value per year, which identifies modeled exposure but not a property's insurance premium, deductible, elevation, or realized loss.
Workplace evidence is modest but concentrated: QCEW reports 692 annual average covered jobs, up 1.91%, and natural resources and mining accounts for 32.42% of total private covered employment as the largest disclosed supersector. This is county workplace employment, not resident employment or a forecast; tenant and employer concentration need address-level review. Net migration was 7 tax-return households, yet incoming movers' average AGI was $13,656 below that of outgoing movers, so a positive count does not establish stronger renter income. The record shows 16 purchases and a 12.5% investor share, a buyer-mix indicator rather than proof of rental absorption or broad demand.
Limits are material: Realtor.com MLS listing price, active listings, days on market, and price-reduced share are not published, preventing a read on visible supply, asking-price pressure, marketing time, or seller concessions. Only 6 of 8 evidence groups are available. Next checks are current market-rent comps and lease terms; parcel flood zone, insurance quotes, and claims history; tax assessment; transaction comps; and the local employer base. Those items determine whether the county-level caution can be converted into property underwriting.