The median Marietta homeowner pays $2,697/year in property taxes. That is 3.71% of median household income. See how Marietta compares and check your savings potential.
The square at the heart of Marietta, with Glover Park in the middle and the Cobb County courthouse a block away, anchors one of metro Atlanta's oldest cities, one that stretches from historic in-town districts to the neighborhoods around Kennesaw Mountain and the Lockheed Martin plant beside Dobbins Air Reserve Base. Marietta's 62,263 residents occupy a housing stock as varied as any in the region, and the market prices it accordingly. The median home value stands at about $448,500, about 10 percent above the Cobb County median of $407,200. Cobb's effective property tax rate is comparatively moderate at about 1.21 percent, but on values like these the stakes are not small, and the typical Marietta homeowner, with a median household income of $72,725, devotes about 3.7 percent of it to property taxes. That gap between home values and incomes is exactly where over-assessment stings. Home values across Cobb County span roughly $299,081 to $586,625 through the middle half of the market, and Marietta covers nearly that entire range by itself, from 1950s ranches to new builds near the square. Countywide appraisal formulas frequently smooth over those differences, valuing a dated house as if it had the finishes of the renovated one next door. Check the value on your annual notice against what comparable homes actually sold for, because if it is inflated, you have 45 days from the date printed on that notice to file an appeal under Georgia law.
Marietta Appeal Quick Facts
The median home in Marietta is valued at $448,500, and the typical homeowner pays about $2,697 per year in property tax (Census ACS 2024), based on Cobb County's 3.015% combined millage applied to 40% of fair market value after exemptions. That means the typical Marietta homeowner spends 3.71% of household income on property taxes alone. Marietta combines higher-than-average home values with a heavy tax burden. If your home is overassessed by even 10%, the cost adds up fast. Higher home values mean a larger tax bill and a bigger payoff from a successful appeal. At $448,500, Marietta home values are 10% above the Cobb County median, 163% above Georgia's statewide median of $170,200, 41% above the national median of $318,000.
Check If Your Marietta Home Is Overassessed
Smyrna leads Cobb County in home values, but your individual assessment could still be too high regardless of where Marietta falls in the county ranking.
With a population of 62,263, Marietta has plenty of recent sales to draw from. The strongest evidence is 3-5 comparable sales: homes similar to yours in size, age, and condition that sold recently for less than your assessed value. Focus on per-square-foot price comparisons and adjust for differences in lot size, condition, and amenities. For the full evidence strategy, exemption details, and step-by-step filing instructions, see our Cobb County Property Tax Guide.
Based on a combined tax rate of 3.015%. Your actual rate may vary by tax district.
A 10% reduction on the median Marietta home ($448,500 down by $44,850) would save approximately $541 per year, or $1,623 over three years with the 299c value freeze.
At 3.71% of household income, even a modest reduction in your assessed value makes a real difference in your annual budget.
Property tax appeals in Marietta are filed with the Cobb County Board of Assessors. You have 45 days from the date of your assessment notice to submit a PT-311A form.
Cobb County Board of Assessors: 736 Whitlock Avenue, Suite 200, Marietta, GA 30064 | 770-528-3100 For the full appeal process and deadline details, see our Cobb County Property Tax Guide.
Based on 2024 American Community Survey estimates and Cobb County millage rates.