Neuendorf is a municipality in the district of Gäu in the canton of Solothurn in Switzerland.

[3] Neuendorf has an area, as of 2009[update], of 7.16 square kilometers (2.76 sq mi).

Of the rest of the land, 1.24 km2 (0.48 sq mi) or 17.3% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.1% is either rivers or lakes.

The blazon of the municipal coat of arms is Azure a Cross pattee couped Argent.

[8] Most of the population (as of 2000[update]) speaks German (1,733 or 96.5%), with Albanian being second most common (14 or 0.8%) and Italian being third (11 or 0.6%).

[7] The age distribution, as of 2000[update], in Neuendorf is; 157 children or 8.7% of the population are between 0 and 6 years old and 352 teenagers or 19.6% are between 7 and 19.

[8] The historical population is given in the following chart:[3][13] The entire village of Neuendorf is part of the Inventory of Swiss Heritage Sites.

[14] In the 2007 federal election the most popular party was the CVP which received 36.55% of the vote.

In the federal election, a total of 716 votes were cast, and the voter turnout was 51.8%.

[8] There were 1,018 residents of the municipality who were employed in some capacity, of which females made up 43.0% of the workforce.

The number of jobs in the primary sector was 46, of which 42 were in agriculture and 4 were in forestry or lumber production.

The number of jobs in the secondary sector was 111 of which 66 or (59.5%) were in manufacturing, 2 or (1.8%) were in mining and 41 (36.9%) were in construction.

In the tertiary sector; 661 or 36.0% were in wholesale or retail sales or the repair of motor vehicles, 1,069 or 58.2% were in the movement and storage of goods, 9 or 0.5% were in a hotel or restaurant, 2 or 0.1% were the insurance or financial industry, 10 or 0.5% were technical professionals or scientists, 54 or 2.9% were in education and 9 or 0.5% were in health care.

[8] From the 2000 census[update], 1,163 or 64.8% were Roman Catholic, while 356 or 19.8% belonged to the Swiss Reformed Church.

The education system in the Canton of Solothurn allows young children to attend two years of non-obligatory Kindergarten.

All the lower secondary students from Neuendorf attend their school in a neighboring municipality.