Choosing between Oldham County vs. Jefferson County is one of the biggest decisions when building a custom home near Louisville. Both counties offer exceptional addresses. The tax bill, school district, and available land differ in ways that shape your budget for decades. Eldridge Company, a custom home builder Louisville KY buyers can consult early in the land search, compiled this comparison from official public records.
Jefferson County has a lower school tax rate and established neighborhoods. Where a lot sits inside Jefferson County can change your bill more than the county line does. Oldham County generally offers more acreage and one countywide school district, along with a higher school levy. Verify every figure for your exact parcel before you buy.
In Kentucky, your bill equals the assessed value, minus exemptions, multiplied by the rate per $100, according to the Jefferson County Sheriff’s Office. Rates stack by taxing district, so two lots in the same county can carry different bills.
The 2025 Jefferson County Tax Rate Schedule lists these real property rates per $100:
On a $500,000 home outside the Urban Services District, the state, Metro, and school rates total $0.941. That comes to about $4,705 per year before fire district charges. Inside the district, the total rises to $1.260, or about $6,300. Metro’s public hearing notice explains that the district funds fire protection, solid waste management, and street services.
Oldham County property tax uses the same formula, but its school levy is higher. The Oldham County Board of Education reports a fiscal 2026 levy of 81.2 cents per $100 and proposes 82 cents. The school portion alone is $4,060 on a $500,000 home, rising to $4,100 if adopted. The same home at the JCPS rate of 71.7 cents pays $3,585. State, county, and any city or library levies come on top, so request a parcel-specific estimate from the Oldham County Property Valuation Administrator.
Kentucky’s homestead exemption reduces assessed value by $49,100 for owners age 65 or older or those with a total disability, per the 2025 schedule. If you plan to retire in your new home, that matters. Budget taxes on the finished value of the home, not the lot price.
Oldham County Schools operates one district across the county.
Jefferson County is served by Jefferson County Public Schools, Louisville’s largest district. WDRB reported in 2025 that it faces a budget shortfall of roughly $100 million. Student assignment depends on your address, so confirm the assigned schools before you close on a lot.
Compare individual schools instead of districts. The state’s Kentucky School Report Card is the neutral place to do it.
Oldham County’s Subdivision Regulations govern lot arrangement, size, and shape. They also cover open space subdivisions across the county and the cities of Crestwood, La Grange, and Pewee Valley. For custom home lots, the septic or sewer question matters most.
Jefferson County lots are mostly served by Metro Louisville infrastructure. Large parcels are scarcer, and infill and teardown sites are more common.
Small cities such as Mockingbird Valley set their own rates.
Builders commonly see these differences in costs:
Consider Oldham County if you want acreage, privacy, and one school district, and you accept a higher school levy. Consider Jefferson County if you value proximity to downtown, established amenities, and a lower school rate, and you have checked whether the lot falls inside the Urban Services District.
Is property tax lower in Jefferson County or Oldham County?
It depends on the parcel. JCPS’s school rate (71.7 cents) is lower than Oldham’s (81.2 cents). Jefferson’s Urban Services District adds 32.76 cents, which can reverse the advantage.
Where can I compare schools in each county?
Use the Kentucky School Report Card, then confirm the address-specific school assignment with the district.
Do custom home lots in Oldham County require sewer?
Often, but it varies by location and zoning. Review the subdivision regulations and ask the planning office and Health Department before purchase.
Land choice sets your tax, school, and construction costs. Eldridge Company can walk through parcels in both counties, estimate site costs, and plan the build around your budget. Contact our team to begin your land search.
Eldridge Company LLC, 509 Barret Avenue, Louisville, KY, 40204, United States 502-625-5565 info@eldridgecompany.com