Union County, Ohio Sales Tax Rate
Buying anywhere in Union County? The combined sales tax rate is 7.00%. Below is the full breakdown and a calculator already set to Union County.
Union County Rate Breakdown
Bordering County Savings Radar
How Union's 7.00% rate compares on a $100.00 purchase across county lines
Retail Purchases
Under R.C. 5739.033(B)(1), sales made by Ohio vendors are origin-sourced to where the order is received. Out-of-state remote sellers shipping to Union County charge this 7.00% destination rate.
Vehicle Titling
Under R.C. 4505.06, motor vehicles are taxed strictly by your county of residence at titling. On a $30,000 vehicle, Union County residents owe $2,100.00.
Groceries & Medicine
Unprepared food for human consumption and prescription drugs are 100% exempt ($0 tax) statewide in Union County under the Ohio Constitution (Art. XII, § 13), R.C. 5739.02(B)(2) (food), and R.C. 5739.02(B)(18) (prescription drugs).
Union County's 7.00% rate sits below the statewide average of 7.14%. Across Ohio, combined rates run from 6.50% to 8.00%. Compare all 88 Ohio county rates side by side.
Anywhere in Union County, a taxable purchase adds 1.25% in county and transit tax on top of Ohio's 5.75% state base — the 7.00% combined rate shown above. 10 of Ohio's 88 counties charge this exact rate. Cars, general merchandise, and prepared restaurant food are all taxed at 7.00%, while unprepared groceries and prescription drugs stay exempt statewide.
Ranked against the rest of the state, Union County is the 59th-highest of Ohio's 88 counties, tied with 10 others on 7.00%. In hard numbers that matters most on big-ticket buys: a $30,000.00 car costs $2,100.00 in sales tax here. Registering the same car in Butler County (6.50%, Ohio's lowest) would cost $1,950.00 — a $150.00 difference. At the other end, Cuyahoga County (8.00%) would charge $2,400.00. Ohio taxes a vehicle at the rate of the buyer's county of residence, not the dealer's, so the county on your registration is the one that sets the bill.
Union County is seated at Marysville, covers 437 square miles and is home to 65,293 people — the 37th-most-populous of Ohio's 88 counties, at about 150 people per square mile. 9 ZIP codes fall inside it, running from 43007 to 43344, and every one of them pays the same 7.00% — Ohio municipalities cannot levy a sales tax of their own, so there is no city surcharge anywhere in the county.
Population: U.S. Census Bureau, American Community Survey 5-year estimate (2023).
One important exception in Union County: part of the county falls inside the Central Ohio Transit Authority (COTA) district, where the combined rate is 8.00% rather than 7.00% — a difference of 1.00% that took effect on April 1, 2025. The district covers the part of Dublin that crosses the county line, so the 7.00% figure above applies to most of Union County. If your address sits near the Franklin County line, confirm it against the Ohio Department of Taxation's rate-by-address lookup before filing.
Calculate tax in Union County
Calculate Ohio Sales Tax
Ohio · 2026 tax year · all 88 countiesCalculate total cost and exact Ohio state + county tax on your pre-tax purchase.
An official 2026 estimate based on Ohio Department of Taxation rate schedules (R.C. 5739.02). Actual checkout receipts round intermediate fractions per R.C. 5739.025.
Union County sales tax by purchase amount
| Purchase | Sales Tax (7.00%) | Total |
|---|---|---|
| $1.00 | $0.07 | $1.07 |
| $5.00 | $0.35 | $5.35 |
| $10.00 | $0.70 | $10.70 |
| $25.00 | $1.75 | $26.75 |
| $50.00 | $3.50 | $53.50 |
| $100.00 | $7.00 | $107.00 |
| $500.00 | $35.00 | $535.00 |
| $1,000.00 | $70.00 | $1,070.00 |
Groceries and prescription drugs are exempt statewide, so they carry $0 tax in Union County. Prepared food and general merchandise are taxed at 7.00%.
Union County sales tax FAQ
Statutory guidance reconciled against official Ohio Department of Taxation regulations, county permissive levies, and R.C. 5739 sourcing rules.
The combined sales tax rate in Union County is 7.00% in 2026. That is Ohio's 5.75% state base plus a 1.25% county and transit portion.
At 7.00%, sales tax on a $100 taxable purchase in Union County is $7.00, for a total of $107.00.
No. Unprepared groceries and prescription drugs are exempt from Ohio sales tax statewide, so they are not taxed in Union County. Prepared food is taxable at 7.00%.
9 Ohio ZIP codes have Union County as their primary county, including 43007, 43029, 43036, 43040, 43041. All of them use the 7.00% combined rate. Because ZIP boundaries can cross county lines, a delivery address near the county line should be checked against Ohio's rate-by-address lookup.
Union County borders Delaware (7.00%), Madison (7.00%), Champaign (7.25%), Hardin (7.25%), Logan (7.25%), Marion (7.25%), Franklin (8.00%). None of them charge less than Union's 7.00%.
At 7.00%, Union County has the 59th-highest combined sales tax rate of Ohio's 88 counties, tied with 10 other counties. Statewide, combined rates run from 6.50% to 8.00%.
Counties bordering Union County
Union County shares a line with 7 other Ohio counties. Crossing one of these lines genuinely changes the bill — though which side counts depends on who is selling: an Ohio seller charges its own county's rate on an intrastate sale, while an out-of-state or marketplace seller charges yours.
| County | Combined rate | vs Union | Tax on $30,000.00 |
|---|---|---|---|
| Delaware County | 7.00% | same | $2,100.00 |
| Madison County | 7.00% | same | $2,100.00 |
| Champaign County | 7.25% | +0.25% | $2,175.00 |
| Hardin County | 7.25% | +0.25% | $2,175.00 |
| Logan County | 7.25% | +0.25% | $2,175.00 |
| Marion County | 7.25% | +0.25% | $2,175.00 |
| Franklin County | 8.00% | +1.00% | $2,400.00 |
No county bordering Union charges less than 7.00%, so there is no cheaper neighbour to cross into.
ZIP codes in Union County (7.00% sales tax)
9 Ohio ZIP codes have Union County as its primary county. Every address in them pays the same 7.00% combined rate — 5.75% state plus 1.25% county and transit.
- 43007
- 43029
- 43036
- 43040
- 43041
- 43045
- 43067
- 43077
- 43344
ZIP codes are a USPS delivery construct and a few straddle county lines, so a border address can fall in a different taxing county than its ZIP suggests. Check any borderline address with the ZIP code sales tax lookup or Ohio's official rate-by-address finder before you file.
Compare Union County rates
- Butler — 6.50%
- Cuyahoga — 8.00%
- Franklin — 8.00%
- Hamilton — 7.80%
- Lucas — 7.75%
- Montgomery — 7.50%
- Stark — 6.50%
- Summit — 6.75%
- Ashland — 7.00%
- Brown — 7.00%
- Delaware — 7.00%
- Holmes — 7.00%
- Madison — 7.00%
- Miami — 7.00%
- See all 88 counties →
- Browse Ohio rates by city →
Bordering counties: Compare Union County (7.00%) with neighboring Delaware County (7.00%), Madison County (7.00%), and Champaign County (7.25%).
Commercial sellers: Review our guide on how Ohio use tax applies to untaxed online orders to stay fully aligned with state tax regulations.
Compare statewide: See where Union County ranks across the full Ohio sales tax rates by county table.
Address verification: Some postal ZIP codes in Union County touch adjacent counties. To look up a precise street address, use our Ohio sales tax rate by address tool.
Ohio Sales Tax Core Reference Guides:
Rate source: the 7.00% combined rate for Union County was verified against the Ohio Department of Taxation's County Rate Table by ZIP Code on . Ohio county rates change on quarterly boundaries; for a legally definitive rate at a specific street address, use the Department's The Finder lookup — our guide to using The Finder walks through it.