also divided into 28 census districts. Although their names are identical or nearly identical to the corresponding sub-districts, the census districts of Donaufeld, Greater Jedlersdorf, Old Jedlesee, New Jedlesee, Leopoldau, Schwarzlackenau, Stammersdorf and Strebersdorf have distinct borders. Settlements and parcels of land have given their names to the census districts of Hirschfeld, Nordrandsiedlung, Großfeldsiedlung, Schottenfeld, Siemensstrasse, Jochberg, Donaufelder Gartnergebiet, Mühlschüttel, Bruckhaufen and Industriegelande Bahndreieck. The district of Autokader takes its name from the largest auto plant of the Habsburg monarchy (Austro-Fiat), while Gaswerk Leopoldau is named for the city gas works, opened in 1911. The remaining Floridsdorf census districts are named after streets: Stammersdorf-Brünner Straße, Leopoldauer Straße-Siemensstraße, Strebersdorf-Pragerstraße, Koloniestraße, Shuttleworthstraße, Floridsdorf-Brünnerstraße, Floridsdorf-Am Spitz und Donaufeld-Leopoldauer Straße. Population Population development Today's 21st district includes that area of Floridsdorf which, in 1869, along with its villages, had only 12,022 inhabitants. With the city limits located near Vienna, the population increased rapidly and showed, up to the First World War, very high growth rates. In 1910, Floridsdorf already had 62,154 inhabitants, its population since 1869 having more than quintupled. Since Floridsdorf after the First World War had a comparatively low population density compared to other districts, the local population rose more gradually. Apart from a brief decline around the Second World War, Floridsdorf's population has grown continuously, but with a significant fall from the 1990s on. At the beginning of 2007, there were 137,186 inhabitants - the third largest population among the Vienna districts. In terms of population density, Floridsdorf ranks only in the bottom quarter of the 23 Vienna municipalities, with 3,086 inhabitants per km2. Population structure The population of Floridsdorf comprised, as of 2005, significantly more children, but also a slightly higher proportion of adults over 60, than the Vienna average. The number of children under 15 was 16.2% higher than for Vienna overall (14.6%). The proportion of the population aged 15 to 59 was 61.4% (Vienna: 63.4%), well below the mean, while the 20 to 34 age group showed a decrease. The proportion of inhabitants aged 60 or older was 22.5% (Vienna: 22.0%) slightly above the Vienna average. The gender distribution as of 2001 was 47.3% men and 52.7% women, the number of married people making up 43.0% compared to 41.2% in Vienna as a whole. Language and nationality The proportion of foreign residents in Floridsdorf as of 2006 was 11% (Vienna citywide: 19.1%), ranking fourth among the Vienna municipalities.