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2024 mil rate · Aroostook County, ME
Grand Isle property tax rate
Grand Isle's 2024 mil rate is $19.75 per $1,000 of assessed value. A property assessed at $300,000 owes $5,925.00 for the year. That ranks 93rd highest of Maine's 482 municipalities, in the highest quarter, $5.19 per $1,000 above the $14.56 per $1,000 state median.
- 1Mil rate $19.75 per $1,000
- 2Bill on $300,000 assessed $5,925.00
Your Grand Isle tax bill
The bill before exemptions and credits. Compare every Maine rate.
Grand Isle's rate, ratio and tax base
Maine Revenue Services certified Grand Isle's 2024 ratio at 94%: its assessments average 94% of market value, below market, so the $19.75 rate overstates the tax on a dollar of market value. Multiplying the rate by the ratio gives $18.57 per $1,000 of market value at that average level. The state median ratio is 100%, and 234 municipalities are certified at 100%.
The rate comes from the town's own numbers: Grand Isle committed $481,992 of property tax on $24,404,635 of taxable valuation, and $19.75 per $1,000 on that valuation raises $481,992. That commitment ranks 419th of 482 in Maine and is 0.47% of all the property tax committed in Aroostook County's 64 municipalities; the valuation ranks 441st.
Tax on common assessed values in Grand Isle
| Assessed value | 2024 bill | Versus ME median rate |
|---|---|---|
| $200,000 | $3,950.00 | +$1,038.00 |
| $300,000 | $5,925.00 | +$1,557.00 |
| $400,000 | $7,900.00 | +$2,076.00 |
| $500,000 | $9,875.00 | +$2,595.00 |
| $750,000 | $14,812.50 | +$3,892.50 |
Each bill is the assessed value divided by 1,000 and multiplied by $19.75, before exemptions, credits such as Maine's homestead exemption or special charges. These are assessed values, not sale prices: at a 94% ratio the $300,000 row is a property worth about $319,149. The last column is the difference from the same assessment at the $14.56 per $1,000 state median.
How Grand Isle compares in Aroostook County and Maine
Among the 64 municipalities in Aroostook County, Grand Isle ranks 26th highest; the county median is $17.41 per $1,000, so Grand Isle sits $2.34 per $1,000 above it. The next higher rate in the county is Moro Plantation at $20.02, and the next lower is Allagash at $19.42. Statewide, 80% of municipalities have a lower mil rate than Grand Isle.
Outside Aroostook County, the closest rates are Corinna ($19.75, Penobscot), Eddington ($19.75, Penobscot), Greenville ($19.74, Piscataquis), North Yarmouth ($19.80, Cumberland). Because towns assess at different shares of market value, the rate multiplied by the certified ratio is the better guide to what a house of a given price pays.
Appealing a Grand Isle assessment
In Maine an abatement starts with a written request to Grand Isle's assessors within 185 days of the tax being committed. The assessors have 60 days to decide; then the appeal goes within 60 days to the Board of Assessment Review, or to the Aroostook County commissioners where the municipality has no board, and on to the Superior Court within 30 days (Maine Revenue Services, Property Tax Bulletin No. 10 (revised March 26, 2020)). Overvaluation is judged against how the town assesses similar property on average, which is where Grand Isle's 94% certified ratio comes in: a $300,000 assessment at that ratio corresponds to about $319,149 of market value.
The Maine appeal page sets out each step with its source and the ratio arithmetic. This is a summary of the published procedure, not legal advice.
Grand Isle property tax questions
What is the property tax rate in Grand Isle, ME?
Grand Isle's 2024 mil rate is $19.75 per $1,000 of assessed value. Source: Maine Revenue Services.
How much is the property tax on a $300,000 assessment in Grand Isle?
$300,000 ÷ 1,000 × $19.75 = $5,925.00 a year, before exemptions and credits.
Is Grand Isle's tax rate high for Maine?
It ranks 93rd highest of 482, in the highest quarter of Maine municipalities; the median is $14.56 per $1,000. Its certified ratio is 94%, so its assessments sit below market value on average.
How do I appeal a Grand Isle property assessment?
Written abatement request to the assessors: 185 days after commitment (36 M.R.S. §§ 841–849 (Bulletin 10)). Then: assessors' decision (60 days); appeal to the board of assessment review or county commissioners (60 days); appeal to the superior court (30 days).
Source: Maine Revenue Services, 2024 Municipal Valuation Return Statistical Summary, Section 1 (certified ratio, commitment, tax rate, total taxable valuation), dated November 19, 2025. Appeal steps: Maine Revenue Services, Property Tax Bulletin No. 10 (revised March 26, 2020). Last checked October 21, 2026. This page explains published figures; it is not tax or legal advice.