Änderungen
→Wohnbevölkerung
<!-- === Eingemeindungen === -->
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=== Nachbargemeinden ===
=== Nachbargemeinden ===
Mattsee grenzt an folgende Flachgauer Gemeinden: [[Obertrum am See]], [[Seeham]], [[Schleedorf]]. Nachbargemeinden in Oberösterreich: Palting, Lochen
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<!-- === Klima === -->
<!-- === Klima === -->
<!-- === Religionen === -->
<!-- === Religionen === -->
=== Bevölkerungsentwicklung ===
{| class="toccolours" align="right" cellpadding="4" cellspacing="0" style="margin:0 0 1em 1em; font-size: 95%;"
{| class="toccolours" align="right" cellpadding="4" cellspacing="0" style="margin:0 0 1em 1em; font-size: 95%;"
|-
|-
! align="center"| Datum!! align="right"| Einwohner
! align="center"| Datum!! align="right"| Einwohner
|-
|-
| align="center"| 1869 || align="right"| (ANZAHL)
| align="center"| 1869 || align="right"| 1.029
|-
| align="center"| 1880 || align="right"| 987
|-
|-
| align="center"| 1880 || align="right"|
| align="center"| 1890 || align="right"| 1.006
|-
|-
| align="center"| 1890 || align="right"|
| align="center"| 1900 || align="right"| 1.017
|-
|-
| align="center"| 1900 || align="right"|
| align="center"| 1910 || align="right"| 1.063
|-
|-
| align="center"| 1910 || align="right"|
| align="center"| 1923 || align="right"| 1.051
|-
|-
| align="center"| 1923 || align="right"|
| align="center"| 1934 || align="right"| 1.094
|-
|-
| align="center"| 1934 || align="right"|
| align="center"| 1939 || align="right"| 1.026
|-
|-
| align="center"| 1939 || align="right"|
| align="center"| 1951 || align="right"| 1.478
|-
|-
| align="center"| 1951 || align="right"|
| align="center"| 1961 || align="right"| 1.552
|-
|-
| align="center"| 1961 || align="right"|
| align="center"| 1971 || align="right"| 1.858
|-
|-
| align="center"| 1971 || align="right"|
| align="center"| 1981 || align="right"| 2.089
|-
|-
| align="center"| 1981 || align="right"|
| align="center"| 1991 || align="right"| 2.550
|-
|-
| align="center"| 1991 || align="right"|
| align="center"| 2001 || align="right"| 2.850
|-
|-
| align="center"| 2001 || align="right"|
| align="center"| 2005 || align="right"| 2.972
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