The town of Naujan is a 1st class municipality with a total land area of 50.310 has (as of 2007 census), with a total of 49,279 registered voters (as of 2010) and population of 90,629 (as of Aug. 1,2007).

It has the biggest land area in the whole of Oriental Mindoro, seconded by the town of Bongabong. It is second-most populated municipality with a total of 90,629 compared to the capital city of Calapan which has 116,976 as of the 2007 census.

Naujan has a total 70 Barangays, namely :

1. Adrialuna
2. Antipolo
3. Andres Ylagan (Mag-asawang Tubig)
4. Apitong
5. Arangin
6. Aurora
7. Bacungan
8. Bagong Buhay
9. Balite
10.Bancuro
11.Banuton
12.Barcenaga
13.Bayani
14.Buhangin
15.Caburo
16.Concepcion
17.Dao
18.Del Pilar
19.Estrella
20.Evangelista
21.Gamao
22.General Esco
23.Herrera
24.Inarawan
25.Kalinisan
26.Laguna
27.Mabini
28.Magtibay
29.Mahabang Parang
30.Malaya
31.Malinao
32.Malvar
33.Masagana
34.Masaguing
35.Melgar A
36.Melgar B
37.Metolza
38.Montelago
39.Montemayor
40.Motoderazo
41.Mulawin
42.Nag-Iba I
43.Nag-Iba II
44.Pagkakaisa
45.Paitan
46.Paniquian
47.Pinagsabangan I
48.Pinagsabangan II
49.Piñahan
50.Poblacion I (Barangay Uno)
51.Poblacion II (Barangay II)
52.Poblacion III (Barangay III)
53.Sampaguita
54.San Agustin I
55.San Agustin II
56.San Andres
57.San Antonio
58.San Carlos
59.San Isidro
60.San Jose
61.San Luis
62.San Nicolas
63.San Pedro
64.Santa Isabel
65.Santa Maria
66.Santiago
67.Sta. Cruz
68.Sto. Nino
69.Tagumpay
70.Tigkan

*Source: National Statistics and Coordination Board