Möriken-Wildegg has an area, as of 2009, of 6.6 square kilometers (2.5 sq mi).
 Of this area, 2.48 km² (0.96 sq mi) or 37.6% is used for agricultural purposes, while 2.32 km² (0.90 sq mi) or 35.2% is forested.
  Of the rest of the land, 1.66 km² (0.64 sq mi) or 25.2% is settled (buildings or roads), 0.12 km² (30 acres) or 1.8% is either rivers or lakes and 0.02 km² (4.9 acres) or 0.3% is unproductive land.

Of the built up area, industrial buildings made up 5.5% of the total area while housing and buildings made up 13.8% and transportation infrastructure made up 4.2%.
 Out of the forested land, 33.6% of the total land area is heavily forested and 1.5% is covered with orchards or small clusters of trees.
 Of the agricultural land, 28.0% is used for growing crops and 7.9% is pastures, while 1.7% is used for orchards or vine crops.
 All the water in the municipality is in rivers and streams.

The municipality is located in the Lenzburg district.
 It consists of the village of Möriken, Wildegg Castle, the village section of Wildegg (founded in the 18th Century), the settlement of Hard and the ferry over the Aare river (replaced in 1870 by a bridge).
Möriken-Wildegg has an area, as of 2009, of 6.6 square kilometers (2.5 sq mi).  Of this area, 2.48 km² (0.96 sq mi) or 37.6% is used for agricultural purposes, while 2.32 km² (0.90 sq mi) or 35.2% is forested.   Of the rest of the land, 1.66 km² (0.64 sq mi) or 25.2% is settled (buildings or roads), 0.12 km² (30 acres) or 1.8% is either rivers or lakes and 0.02 km² (4.9 acres) or 0.3% is unproductive land.
Of the built up area, industrial buildings made up 5.5% of the total area while housing and buildings made up 13.8% and transportation infrastructure made up 4.2%.  Out of the forested land, 33.6% of the total land area is heavily forested and 1.5% is covered with orchards or small clusters of trees.  Of the agricultural land, 28.0% is used for growing crops and 7.9% is pastures, while 1.7% is used for orchards or vine crops.  All the water in the municipality is in rivers and streams.
The municipality is located in the Lenzburg district.  It consists of the village of Möriken, Wildegg Castle, the village section of Wildegg (founded in the 18th Century), the settlement of Hard and the ferry over the Aare river (replaced in 1870 by a bridge).
Möriken-Wildegg