Sengerema District is one of eight districts in the Mwanza Region

Mwanza Region

Mwanza Region is one of the regions of Tanzania. Its capital is Mwanza, which is also Tanzania's second city.The neighbouring regions are Kagera to the west, Shinyanga to the south, and Mara to the east...

 of Tanzania

Tanzania

The United Republic of Tanzania is a country in East Africa bordered by Kenya and Uganda to the north, Rwanda, Burundi, and the Democratic Republic of the Congo to the west, and Zambia, Malawi, and Mozambique to the south. The country's eastern borders lie on the Indian Ocean.Tanzania is a state...

. It is bordered to the north and east by Lake Victoria

Lake Victoria

Lake Victoria is one of the African Great Lakes. The lake was named for Queen Victoria of the United Kingdom, by John Hanning Speke, the first European to discover this lake....

, to the south by the Geita District

Geita

Geita is a town in Tanzania of approximately 40,000 people, located 90 kilometers west of Mwanza. Geita first came into prominence as the site of a German colonial gold mine. A German gold prospector discovered the mineral in the early 1900s in the hills surrounding modern-day Geita town...

 and to the southeast by the Misungwi District

Misungwi

Misungwi District, Tanzania is located in the Mwanza Region on the shores of Lake Victoria. According to the 2002 Tanzanian National Census, the population is 256,133 with 20,604 of those residents living in an urban area . Misungwi is often spelled with an extra 's' to make it Missungwi...

.

According to the 2002 Tanzania National Census, the population of Sengerema District was 501,915. http://www.tanzania.go.tz/census/census/districts/sengerema.htm
acconding to the election of 2010 there is an addition of four wards which is Nyampulukano.