Algonac property taxes & housing data
Algonac is taxed at 37.2823 mills across 1 school district. That is 10.22 mills above the St. Clair County median and 4.68 mills above the Southeast Michigan median — the 24th lowest of 31 municipalities in the county, and 143 of 236 region-wide.
Rates by school district
| School district | Homestead | Non-homestead | $250,000 | $350,000 | $500,000 |
|---|---|---|---|---|---|
| Algonac Community School District | 37.2823 | 55.2823 | $4,660 | $6,524 | $9,321 |
Homestead (PRE) applies to your primary residence. Non-homestead applies to rentals and second homes. Dollar columns are the annual bill at the uncapped taxable value — half the purchase price — at the homestead rate.
How Algonac compares in St. Clair County
| Municipality | Lowest millage | Annual tax on $350,000 |
|---|---|---|
| Kenockee Township | 27.6076 | $4,831 |
| Fort Gratiot Township | 28.1448 | $4,925 |
| Brockway Township | 28.6411 | $5,012 |
| Port Huron Township | 30.9408 | $5,415 |
| Algonac | 37.2823 | $6,524 |
| Marine City | 38.1132 | $6,670 |
| St. Clair | 38.9814 | $6,822 |
| Marysville | 39.9654 | $6,994 |
| Port Huron | 41.3099 | $7,229 |
← Port Huron Township (lower) · Marine City (higher) →
For sale in Algonac right now
18 active listings in Algonac — the 6 newest below. Remember: every one of them uncaps the year after closing, so the bill you should budget is the uncapped one above, not the seller's.
$72,500
420 Columbia Street · Algonac
4 bd · 2 ba · 1,644 sqft
Listing courtesy of Braven Enterprises LLC
$269,900
474 Maple ST · Algonac
3 bd · 2 ba · 1,326 sqft
Listing courtesy of Epique Inc.
$679,000
139 CHANNELSYDE RD · Algonac
3 bd · 3 ba · 2,036 sqft
Listing courtesy of Shanks Real Estate
$299,900
141 Milton ST · Algonac
2 bd · 3 ba · 1,440 sqft
Listing courtesy of KW Platinum
$599,900
113 Roselawn ST · Algonac
3 bd · 2 ba · 1,297 sqft
Listing courtesy of Sine & Monaghan Realtors LLC Algonac
$214,900
1401 Saint Clair BLVD · Algonac
2 bd · 1 ba · 1,400 sqft
Listing courtesy of RE/MAX Advisors
IDX provided courtesy of Realcomp II Ltd. via Match Realty LLC and MiRealSource, Realcomp II Ltd, ©2026 Realcomp II Ltd. Shareholders. The accuracy of all information, regardless of source, is not guaranteed or warranted. All information should be independently verified. Listings refreshed 2026-09-04T09:58-04:00; refreshed at least twice daily.
Waterfront in Algonac: St. Clair River · Lake St. Clair — recorded sale prices and all-sports status for each.
Compare Algonac with another community
Algonac has 6 side-by-side comparisons, 2 of them with a community that shares a school district — same schools, different bill. Dollar columns are the annual homestead bill on a $350,000 home at the uncapped taxable value, and the last column is the difference against Algonac.
| Comparison | Their lowest millage | Annual tax on $350,000 | vs Algonac |
|---|---|---|---|
| Algonac vs Clay Township · same schools | 25.2550 | $4,420 | −$2,105 |
| Algonac vs Ira Township · same schools | 27.5526 | $4,822 | −$1,703 |
| Algonac vs Brockway Township | 28.6411 | $5,012 | −$1,512 |
| Algonac vs Port Huron Township | 30.9408 | $5,415 | −$1,110 |
| Algonac vs St. Clair | 38.9814 | $6,822 | +$297 |
| Algonac vs Marine City | 38.1132 | $6,670 | +$145 |
What it's like to own in Algonac
Beyond the tax rate, three things shape what owning in Algonac actually costs: the age of the homes, what the water utility reports at the tap, and what local air testing has turned up. Each figure below carries the date of the survey it came from.
Housing stock
1964
average year built · 1,459 sqft average across 1,102 single-family homes
SEMCOG Buildings_2024
Radon
1.2 pCi/L
average across 20 home tests · 7% above the EPA 4 pCi/L action level — low. ZIP 48001.
MDHHS indoor radon test results by ZIP
Lead is measured at the water system, not the house — it cannot tell you whether a specific property has a lead service line. Radon is a ZIP-level test distribution, not a prediction for any one home; the EPA recommends testing every home regardless. Screening information only.
Common questions
What is the property tax rate in Algonac, Michigan?
Algonac is taxed at 37.2823 mills for a homestead (principal residence) under the official 2025 Michigan Department of Treasury millage report. On a $350,000 home at the uncapped taxable value that is about $6,524 a year.
Does the tax rate change by address within Algonac?
No. All of Algonac sits in Algonac Community School District, so the millage is 37.2823 at every address in the municipality. Your bill still changes after you buy, because it is recalculated on the uncapped taxable value rather than the seller's capped one.
How much are property taxes on a $350,000 home in Algonac?
About $6,524 a year at the homestead rate. Michigan taxes the taxable value, not the sale price, and after a sale that value uncaps to roughly half what you paid — so $350,000 is taxed on about $175,000.
Why is the tax bill on a Algonac listing lower than what I would pay?
Because the figure on the listing is the seller's. Michigan caps annual taxable-value growth while an owner keeps the property, and that cap is removed the year after it sells. The longer the seller owned it, the further their bill sits below yours.
How does Algonac compare with the rest of St. Clair County?
It is the 24 lowest of 31 municipalities in St. Clair County and 143 of 236 across the eight-county region — 10.22 mills above the county median.
What your Algonac taxes become after you buy
Michigan taxable value uncaps the year after a sale and resets to roughly half the purchase price. The calculator below is already set to Algonac — enter a price and the seller's current taxable value.
Uncapping calculator
When a Michigan home changes hands, its taxable value uncaps the following year and resets to roughly half the sale price. Buyers routinely get blindsided by a bill that's thousands higher than the listing showed. Here's your actual number.
What will your tax bill be after closing?
Your taxable value uncaps the year after closing and resets to roughly half the purchase price — so a $350,000 home is taxed on about $175,000, whatever the seller was paying. Enter the price and the current taxable value below.