Cobb County, GA property tax
Census ACS 2023 5-year estimates · updated 2026-09-20
The median effective property tax rate in Cobb County is 0.69%, below the Georgia median of 0.81% and below the national median of 0.98%. The median homeowner pays $2,560 a year on a home worth $373,700.
- Effective rate
- 0.69%
- Median annual bill
- $2,560
- Median home value
- $373,700
- Rank in Georgia
- 139of 159
Median annual bill divided by median home value, Census ACS 2023 5-year estimates.
Estimated annual bill by home value
| Home value | Estimated bill | Per month |
|---|---|---|
| $200,000 | $1,380 | $115 |
| $300,000 | $2,070 | $172 |
| $400,000 | $2,760 | $230 |
| $500,000 | $3,450 | $288 |
| $750,000 | $5,175 | $431 |
| $1,000,000 | $6,900 | $575 |
Cobb County millage rate by year, 2021 to 2025
In 2025, Cobb County levied 8.460 mills in unincorporated areas and the school district 18.700 mills, 27.160 mills combined (27.490 in 2021). On a $300,000 home, assessed at 40% or $120,000, that is $3,259 a year before exemptions. City taxes and special districts such as fire services, listed below, add to it where they apply.
| Year | County, unincorporated | School | Combined | On a $300,000 home |
|---|---|---|---|---|
| 2025 | 8.460 | 18.700 | 27.160 | $3,259 |
| 2024 | 8.460 | 18.700 | 27.160 | $3,259 |
| 2023 | 8.460 | 18.700 | 27.160 | $3,259 |
| 2022 | 8.460 | 18.900 | 27.360 | $3,283 |
| 2021 | 8.590 | 18.900 | 27.490 | $3,299 |
Millage rates for cities and districts in Cobb County
| District | 2025 | 2024 | 2023 | 2022 | 2021 |
|---|---|---|---|---|---|
| Acworth | 8.950 | 8.950 | 8.950 | 8.950 | 8.950 |
| Austell | 8.250 | 3.250 | 3.250 | 3.250 | 3.250 |
| CID Cumberland 01 | 5.000 | 5.000 | 5.000 | 5.000 | 5.000 |
| CID Marietta | 5.000 | 5.000 | 5.000 | 5.000 | 5.000 |
| CID Towncenter | 5.000 | 5.000 | 5.000 | 5.000 | 5.000 |
| County Fire District | 2.970 | 2.990 | 2.990 | 2.990 | 2.860 |
| County Incorporated | 8.460 | 8.460 | 8.460 | 8.460 | 8.590 |
| County SSD Cumberland 02 | 2.450 | 2.450 | 2.450 | 2.450 | 2.450 |
| County SSD Six Flags Area | 0.000 | 3.500 | 3.500 | 3.500 | 3.500 |
| Ind School Marietta | 17.970 | 17.970 | 17.970 | 17.970 | 17.970 |
| Kennesaw | 9.150 | 9.250 | 9.250 | 9.500 | 9.500 |
| Mabelton SSD Six Flags Area | 3.500 | ||||
| Marietta | 4.692 | 4.692 | 4.692 | 4.817 | 4.992 |
| Marietta D/t Dev Authority | 1.453 | 1.453 | 1.453 | 1.647 | 1.641 |
| Powder Springs | 9.500 | 9.500 | 9.500 | 9.500 | 9.500 |
| Smyrna | 8.990 | 8.990 | 8.990 | 8.990 | 8.990 |
Property tax rates by city in Cobb County
Among the 9 places listed, Roswell city has the highest median effective rate at 0.83% and Austell city the lowest at 0.51%, against 0.69% for the county as a whole.
| Place | Effective rate | Median bill | Median home value | Population |
|---|---|---|---|---|
| Roswell city * | 0.83% | $4,296 | $520,500 | 92,577 |
| Marietta city | 0.62% | $2,477 | $401,100 | 61,773 |
| Smyrna city | 0.81% | $3,323 | $409,000 | 56,285 |
| Mableton CDP | 0.68% | $2,090 | $306,200 | 42,403 |
| Kennesaw city | 0.82% | $2,400 | $291,300 | 33,627 |
| Acworth city | 0.81% | $2,524 | $309,800 | 22,370 |
| Powder Springs city | 0.80% | $2,256 | $283,700 | 17,414 |
| Vinings CDP | 0.58% | $3,202 | $551,700 | 13,538 |
| Austell city * | 0.51% | $1,315 | $255,700 | 8,351 |
Cobb County compared with Georgia and the US
| Area | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Cobb County | 0.69% | $2,560 | $373,700 |
| Georgia median | 0.81% | $2,214 | $272,900 |
| United States median | 0.98% | $2,969 | n/a |
Cobb County compared with neighboring counties
Cobb County borders 5 counties. Ranked from lowest to highest median effective rate, it places 1 of 6, the lowest in its area.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Cobb County | 0.69% | $2,560 | $373,700 |
| Cherokee County | 0.70% | $2,734 | $389,800 |
| Bartow County | 0.73% | $1,901 | $262,200 |
| Douglas County | 0.79% | $2,079 | $262,200 |
| Paulding County | 0.85% | $2,444 | $289,000 |
| Fulton County | 0.89% | $3,847 | $431,200 |
Georgia statewide: Standard $2,000 state homestead exemption from county and school taxes, deducted from the 40% assessed value. Counties and school districts add their own, often much larger, local exemptions.
Due dates and payment
Georgia statewide: varies by county; most bills due between October 15 and December 20. Confirm the local schedule with the Cobb County tax office.
Appealing your assessment
Appeal within 45 days of the date the annual assessment notice was mailed. Bring recent sales of comparable homes, photos of condition issues, and any error in the record such as square footage or lot size. How to appeal, step by step.
How Georgia assesses value
40% of fair market value, then county and school millage applied. Full Georgia rules, exemptions and deadlines.
Rates and medians: U.S. Census Bureau, ACS 2023 5-year estimates, tables B25103 and B25077. Effective rate is median taxes paid divided by median owner-occupied home value. Places: Census place by county reference file. Georgia millage: Georgia Department of Revenue, county digest millage rates, 2021 to 2025. Neighbors: Census county adjacency file. Rules: Georgia Department of Revenue, Property Tax Homestead Exemptions.
Frequently asked questions
What is the property tax rate in Cobb County, GA?
The median effective property tax rate in Cobb County is 0.69% of home value, below the Georgia median of 0.81% and below the national median of 0.98%. The median homeowner pays $2,560 a year on a median home value of $373,700 (Census ACS 2023 5-year).
How much is property tax on a $400,000 house in Cobb County?
About $2,760 per year at the county's median effective rate of 0.69%, before exemptions. The exact bill depends on the city, school district and special districts that serve the parcel, so treat this as a planning estimate.
When are property taxes due in Cobb County?
Georgia statewide: varies by county; most bills due between October 15 and December 20. Check the Cobb County tax office for the exact local dates.
How do I appeal a property tax assessment in Cobb County?
Appeal within 45 days of the date the annual assessment notice was mailed. Full Georgia rules are on the Georgia page.
What is the Cobb County millage rate?
For 2025, 8.460 mills for the county in unincorporated areas plus 18.700 mills for schools, 27.160 mills combined, from the Georgia Department of Revenue. One mill is $1 per $1,000 of assessed value, and assessed value is 40% of fair market value, so a $300,000 home owes about $3,259 before exemptions. Cities and special districts add their own mills.
How does Cobb County compare with the rest of Georgia?
Cobb County ranks 139 of 159 Georgia counties by effective rate. The Georgia median is 0.81% and the median bill is $2,214.