
Baia is a commune in Tulcea County, Northern Dobruja, Romania.

Beidaud is a commune in Tulcea County, Northern Dobruja, Romania.

Beștepe is a commune in Tulcea County, Northern Dobruja, Romania. Its name comes from Turkish, meaning "five hills/peaks", due to a chain of hills which lie nearby.

C.A. Rosetti is a commune in Tulcea County, Northern Dobruja, Romania. The commune is named for writer Constantin Alexandru Rosetti. It is composed of five villages: C.A. Rosetti, Cardon, Letea, Periprava and Sfiștofca. At the 2011 census, 65.7% of the inhabitants were Romanians, 24.3% Russian Lipovans and 9.8% Ukrainians.

Carcaliu is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Carcaliu. At the 2011 census, 91% of inhabitants were Lipovans and 8.9% Romanians.

Casimcea is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of six villages: Casimcea, Cișmeaua Nouă, Corugea, Haidar, Rahman and Războieni.

Ceamurlia de Jos is a commune in the southeast of Tulcea County, Northern Dobruja, Romania. It has a total population of 2,620 and it has an area of 119,43 km². The Golovița Lake is located south of this commune. Its name is derived from Turkish Çamurlu, meaning "muddy".

Ceatalchioi is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of four villages: Ceatalchioi, Pătlăgeanca, Plauru and Sălceni.

Cerna is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of four villages: Cerna, General Praporgescu, Mircea Vodă and Traian.

Chilia Veche is a commune in Tulcea County, Northern Dobruja, Romania, in the Danube Delta. It gave its name to the Chilia branch of the Danube, which separates it from Ukraine. It is composed of four villages: Câșlița, Chilia Veche, Ostrovu Tătaru and Tatanir.

Ciucurova is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Atmagea, Ciucurova and Fântâna Mare.

Crișan is a commune in Tulcea County, Northern Dobruja, Romania. It includes three villages: Caraorman (45°04′54″N 29°23′20″E), Crișan (45°10′25″N 29°23′26″E) and Mila 23 (45°13′43″N 29°14′57″E).

Dăeni is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Dăeni.

Dorobanțu is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of five villages: Ardealu, Cârjelari, Dorobanțu, Fântâna Oilor and Meșteru.

Frecăței is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of four villages: Cataloi, Frecăței, Poșta and Telița.

Greci is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Greci.

Grindu is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Grindu.

Hamcearca is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of four villages: Balabancea, Căprioara, Hamcearca and Nifon.

Horia is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Cloșca, Florești and Horia.

I. C. Brătianu is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, I. C. Brătianu. It was named after Ion C. Brătianu, Prime Minister of Romania.

Izvoarele is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Alba, Iulia and Izvoarele.

Jijila is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of two villages, Garvăn and Jijila.
Jurilovca is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Jurilovca, Vișina and Sălcioara.

Luncavița is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of two villages, Luncavița and Rachelu. It also included Văcăreni village until 2003, when it was split off to form Văcăreni Commune.

Mahmudia is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Mahmudia. It included the villages of Beștepe, Băltenii de Jos and Băltenii de Sus until 2004, when these were split off to form Beștepe Commune.

Maliuc is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of four villages: Gorgova, Ilganii de Sus, Maliuc, Partizani and Vulturu.

Mihai Bravu is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Mihai Bravu, Satu Nou and Turda.

Mihail Kogălniceanu is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Lăstuni, Mihail Kogălniceanu and Rândunica.

Murighiol is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of seven villаges:Murighiol Plopul Colina Dunavățu de Jos Dunavățu de Sus Sarinasuf Uzlina

Nalbant is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Nalbant, Nicolae Bălcescu and Trestenic.

Niculițel is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Niculițel.

Nufăru is a commune in Tulcea County, Northern Dobruja, Romania, thought to be the short-lived ancient capital of Kievan Rus, Pereyaslavets, and called Prislav until 1968. It is composed of four villages: Ilganii de Jos, Malcoci, Nufăru and Victoria.

Ostrov is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of two villages, Ostrov and Piatra.

Pardina is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Pardina.

Peceneaga is a commune in Tulcea County, Northern Dobruja, Romania, on the Danube's east bank. It is composed of a single village, Peceneaga.

Sarichioi is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of five villages: Enisala, Sabangia, Sarichioi, Zebil and Visterna. Besides the ethnic Romanian majority, the commune is home to a sizeable Lipovan community (43.1%).

Sfântu Gheorghe is a commune in Tulcea County, Northern Dobruja, Romania. It is located at the end of the southern arm of the Danube near the Black Sea, in the Dobruja region. It is composed of a single village, Sfântu Gheorghe.

Slava Cercheză is a commune in Tulcea County, Northern Dobruja, Romania. Its name means the Cherkess (Circassian) Slava, in reference to the ethnic group that inhabited the village before the Russo-Turkish War (1877–1878). Besides the titular village, the commune also includes Slava Rusă.

Smârdan is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Smârdan. It is situated on the right bank of the Danube, opposite the city of Brăila.

Somova is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Mineri, Parcheș and Somova.

Stejaru is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Mina Altân Tepe, Stejaru and Vasile Alecsandri.

Topolog is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of seven villages: Calfa, Cerbu, Făgărașu Nou, Luminița, Măgurele, Sâmbăta Nouă and Topolog.

Turcoaia is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Turcoaia.

Văcăreni is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Văcăreni. This belonged to Luncavița Commune until 2003, when it was split off.

Valea Nucarilor is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of three villages: Agighiol, Iazurile and Valea Nucarilor.

Valea Teilor is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of a single village, Valea Teilor.