Petersburg Borough, AK zoning map, flood zone and property lines by address
Free, no account. Or open the Alaska map and tap a lot.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA has 2 FIRM panels covering Petersburg Borough, the newest effective August 2013; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Petersburg house comes from a licensed surveyor and is often on file with the borough or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Alaska borough parcel layers (each borough publishes its own), so a Petersburg lot shows the same lines the borough assessor draws. Petersburg Borough covers about 1,857,055 acres of land and 592,519 acres of water.
Mapped lines are approximate. The Petersburg Borough assessor keeps the parcel record (Petersburg Borough website); a licensed surveyor sets the true corners.
Zoning
Petersburg Borough zones its unincorporated land. ParcelSheet shows the use the borough assessor lists for the lot and links the borough planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Alaska's borough planning and land use law (Alaska Statutes Title 29, Chapter 29.40), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Petersburg lot can add one depends on its district; the borough planning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Setbacks
Setbacks in Petersburg Borough come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the borough zoning office gives them for the lot's district.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Petersburg lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Petersburg Borough?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 2 flood map panels covering Petersburg Borough, the newest effective August 2013. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Petersburg Borough?
Open the Alaska map, type the address, and the parcel outline from the Petersburg Borough assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Petersburg Borough?
Zoning in Petersburg Borough is set by the borough for unincorporated land and by each city inside its own limits. ParcelSheet shows the use code the borough assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Petersburg Borough?
Under Alaska's borough planning and land use law (Alaska Statutes Title 29, Chapter 29.40), boroughs and census areas and cities can allow an accessory dwelling unit, and each sets its own rules. In Petersburg Borough ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
What can I build on 5 acres in Petersburg Borough?
Zoning in Petersburg Borough is set by the borough for unincorporated land and each city inside its own limits. The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Petersburg Borough website.
What are the residential setbacks in Petersburg Borough (2026)?
Setbacks in Petersburg Borough come from the zoning code of the borough, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Petersburg Borough website.
Next to Petersburg Borough: Hoonah-Angoon Census Area, Prince of Wales-Hyder Census Area, Wrangell City and Borough.
The Alaska map · All Alaska boroughs and census areas · Flood zones explained · FIRM panels and LOMAs · All 50 states