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.
- Ohio state base5.75%
- Union County & transit1.25%
- Total you pay7.00%
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%, so where you buy genuinely changes the bill. Ohio is unusual here: for most sales by an Ohio seller to an Ohio buyer the rate follows the seller's location, not yours (R.C. 5739.033(B)(1) sources intrastate sales to where the vendor receives the order). Out-of-state sellers and online marketplaces are the exception — they source to your delivery address, so your home county rate is the one that applies there. See 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 58th-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 73,446 people — the 34th-most-populous of Ohio's 88 counties, at about 168 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.
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 parts of Columbus and Dublin that cross 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
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
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 58th-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 →
Need a different calculation? Try the reverse sales tax calculator, the car sales tax calculator, the discount sales tax calculator, or the use tax calculator.
Shipping somewhere specific? Use the Ohio ZIP code sales tax lookup to confirm the rate for any ZIP code in Union County.
Not sure what's taxable? Read what is taxable in Ohio, Ohio sales tax exemptions, or how to calculate Ohio sales tax.
Ohio's 7.00% Union County rate is waived on qualifying items during the Ohio sales tax holiday (August 7–9, 2026) — the state's only no-sales-tax weekend.
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.