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Your “Alpharetta” Address May Be in Milton, Johns Creek or Forsyth County

The short answer

Often not. The post office uses “Alpharetta” for ZIP codes that cross into the cities of Milton and Johns Creek and into unincorporated Forsyth County. The address does not decide your city, your county or your school district; the parcel does. Check the tax district on the county’s own map before you compare taxes or schools between two listings.

By the Luxury Homes in Alpharetta Editorial Team1 min read Last checked October 19, 2026

A red brick city hall with a columned portico and clock pediment behind a lawn, lampposts and a painted bear sculpture.
Alpharetta City Hall on the City Center green Photo: John Phelan, CC BY 4.0

Two listings can both say “Alpharetta, GA” and still answer to different city halls, county commissions and school boards. That is not an error in the listing. Mailing addresses follow delivery routes; city and county lines follow law.

Fulton County Schools’ address records give “Alpharetta” as the mailing city for addresses in ZIP codes 30004, 30005, 30009 and 30022, including addresses inside Milton, Johns Creek and Roswell. (Fulton County Schools GIS: Basemap/AddressPoints FeatureServer layer 0 (fields Zip, City, PrefCity), checked 2026-10-19)

Census ZIP area 30004 overlaps the cities of Milton, Alpharetta and Roswell plus unincorporated land, and spans Fulton, Forsyth and Cherokee counties; by land area it is about 61% Milton and 7% Alpharetta. (U.S. Census Bureau, 2020 ZCTA-to-Place and ZCTA-to-County relationship files, checked 2026-10-19)

Which governments can be behind the address

  • The City of Alpharetta, in Fulton County.
  • The City of Milton, in Fulton County, incorporated in 2006.
  • The City of Johns Creek, in Fulton County, incorporated in 2006.
  • Unincorporated Forsyth County, north of the Fulton line.
The four jurisdictions behind an Alpharetta, GA address (schematic) Schematic map, not to scale. Forsyth County lies across the north; the City of Milton to the west; the City of Alpharetta in the center, crossed north to south by GA 400; the City of Johns Creek to the east, bounded by the Chattahoochee River on its southeast side. Roswell lies to the south. Forsyth Countyunincorporated · Forsyth schoolsMiltoncity · Fulton CountyAlpharettacity · Fulton CountyJohns Creekcity · Fulton CountyRoswell & southnot in this guide GA 400Chattahoochee River N Downtown & AvalonWindwardMiltonJohns CreekSouth Forsyth
Schematic only, not to scale or survey. Lines are approximate; check any parcel on the county map. ZIP-to-city overlap from U.S. Census Bureau ZCTA relationship files

What changes when the line moves

The city share of the tax bill, the homestead exemptions, the zoning code, who issues permits, who answers a code complaint and, on the Forsyth side, the school district. At the same value the yearly tax differs from one jurisdiction to the next:

At a $1,500,000 fair market value, 2025 tax year rates (illustration, not a quote)
Where the home sitsCombined millsYearly tax, no homesteadWith homestead exemptions
City of Alpharetta31.869$19,121$18,595
City of Milton30.622$18,373$18,010
City of Johns Creek29.861$17,917$17,564
South Forsyth24.522$14,713$14,619
Assessed value is 40% of fair market value; exemptions shown are the basic homestead exemptions; floating-homestead freezes, senior exemptions and fees are not modeled. See every rate and its source.

How to check

  1. Look the parcel up on the county map (Fulton or Forsyth).
  2. Read the tax district it shows.
  3. Confirm schools on the district locator.

Comparing homes across those lines? Gold Peach Realty can pull the tax bill for any listing; see how we work with buyers and sellers.

Written by the Luxury Homes in Alpharetta Editorial Team. AI tools help us draft; people check every fact before it publishes.

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.

A golf green with a sand bunker on a grassy slope and large homes among spring trees behind it, crape myrtle trunks in front.
Golf and homes at Crooked Creek, Milton · Photo: Thomson200, CC0

Before you write the offer

Talk to a Georgia agent who checks the jurisdiction first.

Gold Peach Realty is the brokerage behind this guide. An agent can confirm which city, county and school district a home actually sits in, pull the tax bill and the homeowners association documents, and line up the closing attorney before your due-diligence period runs out.

Visit Gold Peach Realty Call (770) 283-1223

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