<noinclude>thumb|right|250px|alt=Map of Mexico with Oaxaca highlighted|Map of Mexico with Oaxaca highlighted

thumb|right|250px|alt=Regions and districts of Oaxaca|Regions and districts of Oaxaca

Oaxaca is a state in southern Mexico that is divided into 570 municipalities, more than any other state in Mexico. According to Article 113 of the state's constitution, the municipalities are grouped into 30 judicial and tax districts to facilitate the distribution of the state's revenues. It is the only state in Mexico with this particular judicial and tax district organization. Oaxaca is the tenth most populated state with inhabitants as of the 2020 Mexican census and the fifth largest by land area spanning .

Municipalities in Oaxaca have some administrative autonomy from the state according to the 115th article of the 1917 Constitution of Mexico. Every three years, citizens elect a municipal president () by a plurality voting system who heads a concurrently elected municipal council () responsible for providing all the public services for their constituents. The municipal council consists of a variable number of trustees and councillors (). Municipalities are responsible for public services (such as water and sewerage), street lighting, public safety, traffic, and the maintenance of public parks, gardens and cemeteries. They may also assist the state and federal governments in education, emergency fire and medical services, environmental protection and maintenance of monuments and historical landmarks. Since 1984, they have had the power to collect property taxes and user fees, although more funds are obtained from the state and federal governments than from their own income.

Municipalities

<gallery caption="Largest municipalities in Oaxaca by population" mode="packed" heights="150">

File:SantoDomingo12-05Oaxaca109.jpg|alt=Santo Domingo Church, Oaxaca|Oaxaca is the capital and largest municipality by population in Oaxaca.

File:Catedral_Tuxtepec.JPG|alt=Cathedral in Tuxtepec|San Juan Bautista Tuxtepec is the second largest municipality by population.

File:Juchitán.jpg|alt=Townhall of Juchitán|The third largest municipality by population in Oaxaca is Juchitán.

File:Borrala.JPG|alt=Monte Albán ruins, Xoxocotlán|Santa Cruz Xoxocotlán is the fourth largest municipality by population.

File:Salina Cruz Bay.jpg|alt=View of the bay of Salina Cruz|The fifth largest municipality in Oaxaca is Salina Cruz.

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!scope="col" rowspan=2| Name

!scope="col" rowspan=2| Municipal seat

!scope="col" rowspan=2| District

!scope="col" rowspan=2| Population<br>(2020)

!scope="col" rowspan=2| Change

!scope="colgroup" data-sort-type="number" colspan=2| Land area|group=lower-alpha

|align=left|Zapotitlán del Río

|align=left|Sola de Vega

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!scope="row" align="left"|San Melchor Betaza

|align=left|San Melchor Betaza

|align=left|Villa Alta

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!scope="row" align="left"|San Miguel Achiutla

|align=left|San Miguel Achiutla

|align=left|Tlaxiaco

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!scope="row" align="left"|San Miguel Ahuehuetitlán

|align=left|San Miguel Ahuehuetitlán

|align=left|Silacayoápam

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!scope="row" align="left"|San Miguel Aloápam

|align=left|San Miguel Aloápam

|align=left|Ixtlán

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!scope="row" align="left"|San Miguel Amatitlán

|align=left|San Miguel Amatitlán

|align=left|Huajuapan

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!scope="row" align="left"|San Miguel Amatlán

|align=left|San Miguel Amatlán

|align=left|Ixtlán

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!scope="row" align="left"|San Miguel Chicahua

|align=left|San Miguel Chicahua

|align=left|Nochixtlán

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!scope="row" align="left"|San Miguel Chimalapa

|align=left|San Miguel Chimalapa

|align=left|Juchitán

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!scope="row" align="left"|San Miguel Coatlán

|align=left|San Miguel Coatlán

|align=left|Miahuatlán

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!scope="row" align="left"|San Miguel del Puerto

|align=left|San Miguel del Puerto

|align=left|Pochutla

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!scope="row" align="left"|San Miguel del Río