The administrative centre of the Mulgi municipality is the town of Abja-Paluoja.

The municipality itself consists of 3 towns (Abja-Paluoja, Karksi-Nuia, Mõisaküla); 2 small boroughs (Estonian: alevikud) (Halliste, Õisu); and 58 villages: Abja-Vanamõisa, Abjaku, Ainja, Allaste, Äriküla, Atika, Ereste, Hirmuküla, Hõbemäe, Kaarli, Kalvre, Kamara, Karksi, Kõvaküla, Kulla, Laatre, Lasari, Leeli, Lilli, Mäeküla, Maru, Metsaküla, Mõõnaste, Morna, Mulgi, Muri, Naistevalla, Niguli, Oti, Päidre, Päigiste, Pärsi, Penuja, Põlde, Polli, Pöögle, Pornuse, Räägu, Raamatu, Raja, Rimmu, Saate, Saksaküla, Sammaste, Sarja, Sudiste, Suuga, Tilla, Toosi, Tuhalaane, Ülemõisa, Umbsoo, Univere, Uue-Kariste, Vabamatsi, Vana-Kariste, Veelikse, and Veskimäe.

[3] There were many discrepancies in the past based on the naming of the Mulgi municipality; the naming council found Mulgi to be a misleading name both culturally and geographically,[4] as the municipality only covers a third of the historical Mulgimaa – the municipalities of Halliste and Karks, to be more specific.

Suggested names in its place included Lääne-Mulgi, Abja-Mulgi, and Halliste-Karksi.

[5] The area has been a developed flax growing region and was one of the most prosperous in Estonia in the 19th century.