Lenzburg is a district of the Canton of Aargau in Switzerland. The capital is the town of Lenzburg. The district contains a total of 20 municipalities:

Coat of arms	Municipality	Population (31 Dec 2005)	Area, km²
	Ammerswil	642	3.19
	Boniswil	1418	2.78
	Brunegg	449	1.56
	Dintikon	1404	3.73
	Egliswil	1340	6.29
	Fahrwangen	1692	5.00
	Hallwil	718	2.18
	Hendschiken	905	3.52
	Holderbank	842	2.32
	Hunzenschwil	2754	3.27
	Lenzburg	7554	11.33
	Meisterschwanden	2364	6.86
	Möriken-Wildegg	3754	6.62
	Niederlenz	4011	326
	Othmarsingen	2209	4.71
	Rupperswil	3986	6.22
	Schafisheim	2675	6.33
	Seengen	3009	10.35
	Seon	4558	9.61
	Staufen	2317	3.58
Total		48,601	102.75

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