Pull up three different sites this month and ask each one for Marietta's median home price, and you will get three different answers. Houzeo puts it at $435,000 as of mid-August 2026, down slightly from a year ago. Zillow's home value index showed $452,615 as of late June. Redfin's median sale price over the three months ending in May was $475,000, up 4.3 percent year over year. None of these numbers is wrong. They are measuring different things, because "Marietta" is not one place, and the boundaries each platform draws around it do not match.
That mismatch is not just a data quirk for buyers to shrug off. It is a preview of something more consequential waiting in the actual paperwork: two houses that both carry a Marietta mailing address, sit in the same ZIP code, and list for similar prices can land in different school districts and owe property tax bills that differ by more than double, for reasons that have nothing to do with the size of the lot or the finish level of the kitchen.
The ZIP Code Doesn't Draw the Line
ZIP codes 30060, 30062, 30064, 30066, 30067, and 30068 all carry "Marietta, GA" as their postal city. Only part of that footprint sits inside the actual incorporated City of Marietta. The rest is unincorporated East Cobb, governed directly by Cobb County, and residents there typically have a Marietta mailing address without being inside the city limits at all.
That distinction determines which government sends you a tax bill and which school system your address is zoned into, and the two systems are entirely separate. Marietta City Schools is the only district in Cobb County that operates independently from the Cobb County School District. A house inside actual city limits might be zoned to A.L. Burruss Elementary, Park Street Elementary, or Marietta Middle School. A house a few streets over, carrying the same "Marietta, GA" address but sitting in unincorporated East Cobb, is zoned instead into schools like Mount Bethel Elementary, Sedalia Park Elementary, Dickerson Middle, or Wheeler High.
| Inside Marietta city limits | Unincorporated East Cobb (same ZIP) | |
|---|---|---|
| Who taxes you | City of Marietta plus Cobb County | Cobb County only |
| School system | Marietta City Schools (independent district) | Cobb County School District |
| Example schools | A.L. Burruss Elementary, Sawyer Road Elementary, Marietta Middle School | Mount Bethel Elementary, Dickerson Middle, Wheeler High |
| Tax bills you receive | Two, one from each government | One, from the county |
If a school assignment matters to your decision, the ZIP code on a listing sheet will not tell you which side of that line a specific parcel sits on. The city limits run down individual streets, not around whole ZIP codes.
One Mill Isn't the Story
You might expect the jurisdiction split to explain most of the cost difference between homes on either side of that line, but the millage math does not support that on its own. Marietta's own tax office lists a 2022 breakdown of 4.817 city mills, 8.46 county mills, and 17.97 mills for Marietta City Schools, totaling 31.247. For the 2025 tax year, Marietta's adopted total sat at 31.122 mills, while unincorporated Cobb came in at 30.13. That is less than a one-mill gap between being inside the city and being just outside it, which on an average home works out to a few dozen dollars a year, not the kind of spread that would make headlines.
And yet it does show up in the actual bills people pay. A ZIP-level breakdown from Ownwell, a property tax appeal service that tracks Cobb's tax roll, found effective property tax rates inside Marietta-addressed ZIP codes ranging from 0.41 percent in 30060 up to 0.99 percent in 30068, more than double, even though 30068 also carries one of the higher median home values in that set at $559,930 against a citywide median of $428,540. Ownwell attributes the spread mainly to differing school district levies and local assessment districts. That is true as far as it goes. But there is a second force working underneath those levies that almost nobody explains to a buyer before they write an offer.
The Bill on the Listing Belongs to Someone Else
Georgia gives homesteaded owners a floating exemption, and Cobb County's version is one of the more generous in the state. Once a property owner occupies a home as their primary residence and files for the exemption, the county's Board of Tax Assessors locks in a base year value for that home. Each time the county reassesses and the market value climbs, the exemption grows automatically so the owner does not pay more in county general fund tax purely because of the reassessment. Marietta's own city exemption works the same way for city millage lines, calling the frozen figure a "base year," and it applies to the city, parks bond, redevelopment bond, and cemetery portions of the bill for anyone who has held a homestead exemption inside city limits.
Here is what that means in practice. The tax figure printed on a listing sheet reflects the current owner's base year, which might be five years old, ten years old, or older. It has nothing to do with what you will pay. Exemptions do not transfer at sale. Once you close, the county resets the assessed value to something closer to your purchase price, and your bill starts from that new number, not the seller's.
This is not a small technicality. In July 2026, Cobb County's Board of Commissioners issued a public notice confirming that homeowners who have held their exemption will see no change in their county general fund tax for the year, because the floating exemption keeps the net taxable value flat even as overall property values in the county keep climbing. That protection is still worth less than it looks, because by the assessors' own rules the floating exemption only covers the county general fund. It does not touch school tax, bond debt, or fire protection, which is precisely why school millage, the single largest line on most Cobb bills, keeps rising for homesteaded owners even while their county portion holds still.
The state tried to build something broader. In 2024, the legislature passed and voters approved a constitutional amendment, House Bill 581, creating a statewide floating homestead exemption that would have capped annual assessment increases at the rate of inflation across county, school, and city levies together, with local governments given the option to backfill lost revenue through a sales tax. Cobb County, the City of Marietta, and Marietta City Schools all filed to opt out of that statewide cap ahead of the March 1, 2025 deadline, concluding that their existing local exemption already did more for homesteaded taxpayers. Commissioner Keli Gambrill argued the state's proposal "was written to do what Cobb County currently does," and the county said plainly that its own floating exemption "provides a greater benefit to taxpayers." Whether or not that argument holds for every household, the opt-out means Cobb kept the narrower, county-general-fund-only version rather than adopting the broader one the state offered.
Before You Write the Offer
A few habits translate this directly into your search:
- Ask your lender or agent to model your tax bill off your actual purchase price and the current millage rate for that specific address, not off the number printed on the listing sheet.
- Confirm whether a parcel sits inside Marietta city limits or unincorporated Cobb before you get attached to a particular school. The line runs street by street, and Cobb County School District or Marietta City Schools can confirm a specific address faster than a listing's school field can.
- Remember that homestead exemptions do not transfer. You will need to own and occupy the home as of January 1 and file your own application by April 1 to get any exemption for that tax year. Close after January 1 and you may be paying full assessed value with no exemption at all until the following year.
- At closing, expect the buyer and seller to prorate the current year's tax bill by contract, since Georgia law makes whoever owns the property on January 1 responsible for that full year's tax regardless of when the sale happens.
None of this changes whether a specific Marietta home is the right one for you. It just means the number on the listing sheet is a description of somebody else's ownership history, not a preview of yours.
A Short FAQ
Does buying a home with a Marietta address mean my kids will attend Marietta City Schools? Not automatically. Many homes with a Marietta, GA mailing address sit in unincorporated East Cobb and are zoned into Cobb County Schools instead. The city limits, not the ZIP code, determine the district.
If the seller has a homestead exemption, do I inherit it when I buy? No. Georgia homestead exemptions are tied to the individual owner-occupant and do not transfer at sale. You will need to file your own application with the county after you close.
Why do different real estate sites show different median prices for Marietta? Each platform draws its own geographic boundary. Some track only the incorporated city, while others include every ZIP code that carries a Marietta mailing address, which pulls in higher-value unincorporated East Cobb neighborhoods and pushes the median up.
If you are comparing homes across the Marietta area and want to know exactly which jurisdiction, school zone, and tax picture applies to a specific address before you write an offer, Pam Breen and the GibsonBreen team can walk through it with you. Let's Connect.
