North of the Fulton County line, Forsyth County’s own school-district records list thousands of addresses in ZIP codes 30004 and 30005 with Alpharetta as the city. They are in unincorporated Forsyth County: no city government, county services and Forsyth County Schools.
Forsyth’s homestead exemptions work differently from Fulton’s, with a base-year freeze on county and fire taxes, so compare the whole bill, not just the millage.
- No city levy
- Forsyth County Schools
- Newer subdivisions
| Government | Forsyth County (unincorporated) |
|---|---|
| County | Forsyth |
| Public schools | Forsyth County Schools (confirm by address) |
| Typical lot | Neighborhood lot |
Trade-off: The lowest combined millage of the four, but a different county, a different school district and fewer city services.
Sourced facts for the Forsyth side
- Forsyth County Schools' address GIS lists 7,376 Forsyth County addresses in ZIP 30004 and 3,217 in ZIP 30005 with the city name 'Alpharetta'. No other ZIP in that data uses 'Alpharetta'. Forsyth County Schools GIS: FCSS_FY2025 FeatureServer layer 4 (address_FY2025), checked 2026-10-19
- A 2025 home in unincorporated south Forsyth (Alpharetta mailing address) faced 24.522 mills before exemptions: 7.896 county including fire, plus 16.626 school. Forsyth County: 'Forsyth County Commission Adopts Millage Rates' (Aug. 8, 2025), checked 2026-10-19
- Forsyth County's regular homestead exemption (S1) takes $8,000 off assessed value for county M&O and fire taxes. School and state taxes get the state's $2,000 exemption. Forsyth County Board of Assessors: Homestead & Other Exemptions (modified Oct. 6, 2026), checked 2026-10-19
- Every Forsyth homestead exemption includes a floating exemption (L7). It freezes the net assessed value for county M&O and fire taxes at the base year set when you apply, while school taxes use the current value. Forsyth County Board of Assessors: Homestead & Other Exemptions (modified Oct. 6, 2026), checked 2026-10-19
- In Forsyth County Schools' FY2025 address data, Forsyth addresses with an Alpharetta mailing address are zoned to Denmark High School (most of 30004 and 30005), West Forsyth High School (part of 30004) or Lambert High School (part of 30005). Forsyth County Schools GIS: FCSS_FY2025 FeatureServer layer 4 (address_FY2025), HS field, checked 2026-10-19
- Forsyth County Schools' GIS/Boundary Planning page links to a School Locator map and a 'Locate School by Address' tool. Forsyth County Schools: GIS Boundary Planning, checked 2026-10-19
Same mail carrier, different county
The post office names an area by its delivery route, not by its government. Our guide to which jurisdiction an Alpharetta address is in explains how to read the county’s own parcel map.
| Where the home sits | Combined mills | Yearly tax, no homestead | With homestead exemptions |
|---|---|---|---|
| City of Alpharetta | 31.869 | $19,121 | $18,595 |
| City of Milton | 30.622 | $18,373 | $18,010 |
| City of Johns Creek | 29.861 | $17,917 | $17,564 |
| South Forsyth | 24.522 | $14,713 | $14,619 |
Questions buyers ask
Which school district serves an Alpharetta address?
Fulton County Schools for homes in Alpharetta, Milton and Johns Creek; Forsyth County Schools for Alpharetta-address homes in unincorporated Forsyth County. Confirm with the district’s locator.
Source: Fulton County Schools
Which high school serves Forsyth County homes with an Alpharetta address?
In Forsyth County Schools’ FY2025 address data, most Forsyth addresses in ZIPs 30004 and 30005 are zoned to Denmark High School, with smaller numbers to West Forsyth and Lambert. Confirm by address.
Source: Forsyth County Schools GIS: FCSS_FY2025 FeatureServer layer 4 (address_FY2025), HS field
Tax rates, exemptions and rules change every year. Every number on this page links to the office that sets it; confirm with that office before you rely on it.
