Only a little part of the surface area of Forssa is water, but the river Loimijoki forms an important element in the cityscape, with the city being located at its starting point.

The city is bordered with Jokioinen to the west, Tammela to the east and south and Humppila and Urjala to the north.

The population of Forssa was as its highest in the middle 1980s when the city had a bit over 20 thousand inhabitants for two years.

[11] The development of Forssa into an industrial conurbation started when industrialist Axel Wilhelm Wahren founded a spinning mill on the shore of the river Loimijoki in 1847.

Today the Forssa industrial community has been classified as a notable constructed cultural environment in Finland.

[14] The depression in the early 1990s had a large impact on Forssa, resulting in economic problems and an unemployment rate that still remains high today.

The coat of arms depicts water power and the river Loimijoki running through the city.

The population development in Forssa from 1847 to 1990 has been researched in the 1995 annual of the Homestead and museum association of Southwestern Tavastia[15] and in the book Forssan historia by Risto O. Peltovuori, published in 1993.

[14] In 1971 the Lempää area of about 9 square kilometres was annexed to Forssa from Tammela, raising the population by about a hundred.

[10] Population concentration spots of the Forssa industrial community are the Kalliomäki wooden house area to the north of the river Loimijoki and the wooden house areas of Vanha Kuhala, Uusikylä and Yliskylä to the south of the river.

Most of the elderly live in Korkeavaha and the city centre, where the proportion of people of 64 years or older is 40 percent.

The Evangelical Free Church has its premises in the Kerhola building commissioned by the Forssa company.

Kalliomäki with its lines was born starting from the 1870s after Wahren had ordered a zoning plan in the area.

As well as the aforementioned areas, there was inhabitation in Kekkala, a little in Pispanmäki and some buildings on the lands of the Viksberg manor.

New apartment buildings were built at the Kartanonkatu and Forssa market square area, as well as Viksberg, in the 1960s.

Perhaps the most famous dismantled building was the "Gingerbread House" located at the intersection between Säästöpankinkatu and Hämeentie.

After Talsoila, new detached houses were built in the north at Lamminranta, Ojalanmäki, Kaikula and Vieremä.

The bird lake of Koijärvi is located in the northern part of the area of dispersed settlement.

The national road 2 was improved in the vicinity of Forssa from 2006 to 2009 by building the new Paavola bridge and a bypass lane in Jokioinen, which also serves as a reserve landing strip for the Finnish Air Force.

The nearest airports for commercial passenger aviation are located in Helsinki, Tampere and Turku.

The statistical district of Kojo also includes the Lempää area, formerly part of the municipality of Tammela.

The villages are divided based on whether they were part of the Forssa market town or the municipality of Koijärvi before the 1969 annexation.

[49] In addition to Forssa, the central urban area spreads over to the municipalities of Jokioinen and Tammela.

The third mineral wool factory of A. Ahlström (now known as Saint-Gobain Isover) was officially inaugurated at Pilvenmäki on 13 Octobner 1971.

The meat refinery company Hakala Oy represents the local food industry.

[60][59] The Ministry of Economic Affairs and Employment named Forssa as an area of sudden structure change from 2008 to 2009 because of layoffs concerning over 500 employees.

[72] Children from the northern part of the central urban area study at the Koijärvi school.

Both youth and adult vocational education are located in the same premises except for the crane training in Faktia.

[76] Higher vocational education is provided by the Forssa branch of the HAMK Häme University of Applied Sciences.

During the late summer and early autumn, the annual silent film festivals are held in Forssa.