Custer County property record for 509 Main St, Ismay, MT 59336
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 725 sqft · built 1920 |
| Lot Size | 0.978 acres (42,602 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $749 (2026) |
| Flood Zone | Zone D (undetermined) |
| APN | 000RIS3153 |
| Primary APN | 000RIS3153 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Plumbing Fixtures | 5 Plumbing Fixtures |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 725 sqft Living Area |
| 1st Floor Area | 725 sqft |
| Basement Area | 725 sqft |
| Unfinished Basement | 725 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1920 |
|---|---|
| Effective Year Built | Effective 1960 |
| Architectural Style | Ranch |
| Exterior Material | Wood |
| Construction Type | Frame |
| Roof Type | Hip |
| Roof Material | Asphalt |
| Lot Area | 42,602 sqft (0.978 acres) |
| Lot Dimensions | 142 ft deep x 300 ft wide |
| Porch | Slab |
|---|---|
| Porch Area | 72 sqft |
| Shed | 1 Shed |
| Shed Area | 100 sqft |
| Granary | Granary |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Well |
| Account Number | 000RIS3153 |
|---|---|
| Street Address | 509 MAIN ST |
| City | ISMAY |
| State | MT |
| Zip | 59336 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | ISMAY ORIGINAL TOWNSITE, S27, T09 N, R55 E, BLOCK 3, LOT 1 - 12 |
| Legal Range | 55E |
| Legal Township | 09N |
| Legal Section | 27 |
| Legal Subdivision | ISMAY ORIGINAL TOWNSITE |
| Legal Block | 3 |
| Legal Lot Number | 1-12 |
| Jurisdiction | CUSTER MT |
| Township / Civil Division | SHIRLEY-ISMAY |
| Census Block Group | 2 |
| Census Block | 2067 |
| Census Tract | 961300 |
509 Main St, a single family home, is owned by an individual.
Source: Custer County records, as of September 9, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | PO BOX 328, ISMAY, MT 59336-0328 |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 509 Main St was $749, up 150.5% from the year before.
Source: Custer County assessment roll, as of September 9, 2026
| Type | Name |
|---|---|
| State | Montana |
| County | Custer County |
| Municipality | Ismay Town |
| Secondary School District | Custer County High School District (09 - 12) |
| Elementary School District | Trail Creek Elementary School District (PK - 08) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $749.00 (+150.5%) | $61,752 (-) | |
| 2025 | $299.00 | $61,752 | $61,752 Land $13,582 Building $48,170 |
| 2023 | $317.00 | $41,253 | $41,253 Land $5,523 Building $35,730 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 509 Main St in Zone D, where flood risk has not been studied.
Source: FEMA National Flood Hazard Layer, effective November 16, 2022 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone D undetermined · not studied |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 2 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 509 Main St is high, ranking above 72% of the US, with a 0.3% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 72% of the US · above 54% of Montana |
|---|---|
| Wildfire Likelihood | 0.3% annual chance |
| Exposure | Direct burnable vegetation |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: FCC Broadband Data Collection, based on 21 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Starlink Satellite | 280 / 30 |
| Mid-Rivers Communications DSL | 10 / 1 |
4G LTE (outdoors only), no 5G reported
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