| Kasba | |
| Settlement Type: | Satellite Town |
| Pushpin Map: | India Bihar#India3 |
| Pushpin Map Caption: | Location in Bihar, India##Location in India |
| Coordinates: | 25.85°N 87.55°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | Region |
| Subdivision Name2: | Mithila |
| Subdivision Type3: | District |
| Subdivision Name3: | Purnia |
| Subdivision Type4: | Urban Agglomeration |
| Subdivision Name4: | Purnia Urban Agglomeration |
| Government Type: | City Council |
| Governing Body: | Kasba Nagar Parishad |
| Unit Pref: | Metric |
| Population Total: | 25522 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Hindi |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 854330 |
| Registration Plate: | BR-11 |
| Blank1 Name Sec1: | Lok Sabha constituency |
| Blank1 Info Sec1: | Purnia |
| Blank2 Name Sec1: | Vidhan Sabha constituency |
| Blank2 Info Sec1: | Kasba |
| Iso Code: | IN-BR |
Kasba is a satellite town of Purnia city and part of Purnia Urban Agglomeration in Purnia district in the Indian state of Mithila region of Bihar.
India census,[1] Kasba had a population of 25,522. Males constitute 53% of the population and females 47%. Kasba has an average literacy rate of 49%, lower than the national average of 59.5%: male literacy is 57%, and female literacy is 41%. In Kasba, 18% of the population is under 6 years of age.
Situated in the North Eastern part of Bihar, Kasba lies between 87.5' Eastern Longitude and 25.8 Degree North Latitude. Covers 0.5% (30 km2) of the state's area. Kasba can be broadly divided into two physiographic units, the Plains and the Plateau. A land endowed with minerals, fertile green fields, peace fallboard force, vast market and a political system committed to industrial growth.[2]
passes through Kasba. This National Highway connects Kasba to Purnia, Siliguri, Guwahati, Kolkata, Muzaffarpur, Patna, Gorakhpur, Lucknow and Porbandar.
Another, State Highway starts from Kasba that direct connects it to Line Bazar(Medical hub of this region), Purnia Court railway station and Kosi Division.
Kasba railway station lies on Barauni-Katihar, Saharsa and Purnia sections. This station has direct trains for, and . Two Express trains pass through Kasba but don't stop here, only DEMU stops here. For long-distance trains, people have to go and for board on their train.