Sales tax rates · ZIP code · Wisconsin

ZIP code 54421 sales tax rates

ZIP code 54421 spans 11 different sets of sales tax jurisdictions in Wisconsin's Streamlined Sales Tax files on 2026-10-22, so there is no single sales tax rate for the ZIP code. The combined general rates of the candidates range from 5% to 5.5%. Look up the full street address (or ZIP+4) to find which one applies.

Accuracy: 5-digit ZIP code.

A published rate is not the tax due on a sale: taxability, sourcing, nexus and exemptions all change what is owed.

Data as of Oct 21, 2026 (Olympus publication) · Markdown version

These are published sales and use tax rates by jurisdiction. They are not the tax due on a transaction and not a taxability determination: whether an item is taxable, which location's rate applies (sourcing), whether the seller must collect (nexus) and any exemption all change what is owed. Rates come from the Streamlined Sales Tax files the states publish or, where a result's source says so, from the state revenue department's own files and pages; confirm with the state before relying on them.
This location matches 11 different jurisdiction sets, so no single rate is returned. Send a full street address or ZIP+4 to narrow it down. The candidate marked sst_default carries the jurisdictions the state's file assigns to the ZIP as a whole (states assign the lowest combined rate there); it is not necessarily the rate at a given address.
Wisconsin's boundary file shortens street names to 20 characters, so a longer street name can match only at ZIP+4 or ZIP level.

Candidate 1 of 11: 5% combined

Wisconsin: assigned by 9 address ranges, 1 5-digit ZIP record in the boundary file WIB2026Q4AUG17. This is the set the state's 5-digit ZIP record assigns to the ZIP as a whole (states give that record the lowest combined rate in the ZIP); it is not necessarily the rate at a given address.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5%	5%	5%

Accuracy: 5-digit ZIP code.

Candidate 2 of 11: 5.5% combined

Wisconsin: assigned by 3 address ranges, 1 ZIP+4 range in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Clark County	county	0.5%	0.5%	0.5%	2009-01-01	WIR2026Q4AUG17 (2026-09-01)
City 00100	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 3 of 11: 5.5% combined

Wisconsin: assigned by 153 address ranges, 31 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Clark County	county	0.5%	0.5%	0.5%	2009-01-01	WIR2026Q4AUG17 (2026-09-01)
City 16150	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 4 of 11: 5.5% combined

Wisconsin: assigned by 206 address ranges, 94 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Clark County	county	0.5%	0.5%	0.5%	2009-01-01	WIR2026Q4AUG17 (2026-09-01)
City 16175	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 5 of 11: 5.5% combined

Wisconsin: assigned by 8 address ranges, 7 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Clark County	county	0.5%	0.5%	0.5%	2009-01-01	WIR2026Q4AUG17 (2026-09-01)
City 31275	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 6 of 11: 5.5% combined

Wisconsin: assigned by 8 address ranges, 17 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Clark County	county	0.5%	0.5%	0.5%	2009-01-01	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 7 of 11: 5.5% combined

Wisconsin: assigned by 16 address ranges, 3 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Marathon County	county	0.5%	0.5%	0.5%	1987-04-01	WIR2026Q4AUG17 (2026-09-01)
City 00100	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 8 of 11: 5.5% combined

Wisconsin: assigned by 90 address ranges, 34 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Marathon County	county	0.5%	0.5%	0.5%	1987-04-01	WIR2026Q4AUG17 (2026-09-01)
City 16150	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 9 of 11: 5.5% combined

Wisconsin: assigned by 36 address ranges, 3 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Marathon County	county	0.5%	0.5%	0.5%	1987-04-01	WIR2026Q4AUG17 (2026-09-01)
City 27150	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 10 of 11: 5.5% combined

Wisconsin: assigned by 49 address ranges, 13 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Marathon County	county	0.5%	0.5%	0.5%	1987-04-01	WIR2026Q4AUG17 (2026-09-01)
City 36325	city	0%	0%	0%	2023-09-18	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Candidate 11 of 11: 5.5% combined

Wisconsin: assigned by 96 address ranges, 36 ZIP+4 ranges in the boundary file WIB2026Q4AUG17.

Jurisdiction	Level	General rate	General rate, interstate	Food and drug rate	Effective from	Source file
Wisconsin (state)	state	5%	5%	5%	1980-01-01	WIR2026Q4AUG17 (2026-09-01)
Marathon County	county	0.5%	0.5%	0.5%	1987-04-01	WIR2026Q4AUG17 (2026-09-01)
Combined (sum of the rates above)		5.5%	5.5%	5.5%

Accuracy: 5-digit ZIP code.

Sources

Streamlined Sales Tax rate file, Wisconsin — Streamlined Sales Tax Governing Board (file posted by the state). WIR2026Q4AUG17.csv, effective quarter 2026Q4, source date 2026-09-01. https://www.streamlinedsalestax.org/ratesandboundry/Rates/WIR2026Q4AUG17.csv
Streamlined Sales Tax boundary file, Wisconsin — Streamlined Sales Tax Governing Board (file posted by the state). WIB2026Q4AUG17.zip, effective quarter 2026Q4, source date 2026-09-01. https://www.streamlinedsalestax.org/ratesandboundry/Boundary/WIB2026Q4AUG17.zip
Published by Olympus on Oct 21, 2026.
Source: the Streamlined Sales Tax Governing Board rate and boundary files, as posted by each member state. The Streamlined Sales Tax Governing Board does not certify Olympus or its use of the data; Olympus is not a Certified Service Provider.

Get this data from the API

The same figures, with provenance on every value, from the API (free API key, reference) or from an AI agent through the Olympus MCP server.

curl

curl -s "https://api.olympus.new-odyssey.com/v1/sales-tax/rates/zip/54421" -H "X-API-Key: $OLYMPUS_API_KEY"

Try it without a key (keyless demo, a few requests per minute)

curl -s "https://api.olympus.new-odyssey.com/v1/sales-tax/rates/zip/54421"

MCP tool call

lookup_us_sales_tax {"zip":"54421"}

Look up a street address in this ZIP code — free, no sign-up
Wisconsin: every sales tax rate