Unterbözberg is a former municipality in the district of Brugg in the canton of Aargau in Switzerland.

Of the rest of the land, 0.59 square kilometers (0.23 sq mi) or 9.6% is settled (buildings or roads).

36.6% of the total land area is heavily forested and 1.3% is covered with orchards or small clusters of trees.

[3] The blazon of the municipal coat of arms is Vert a Bendlet Argent between four Linden tree Leaves Or bendwise.

Most of the population (as of 2000[update]) speaks German (94.4%), with Albanian being the second most common language( 1.5%) and Italian being third ( 1.3%).

[7] The age distribution, as of 2008[update], in Unterbözberg is; 63 children or 8.7% of the population are between 0 and 9 years old and 56 teenagers or 7.7% are between 10 and 19.

[7] From the 2000 census[update], 213 or 28.4% were Roman Catholic, while 417 or 55.7% belonged to the Swiss Reformed Church.

The wettest month is June during which time Unterbözberg receives an average of 116 mm (4.6 in) of rain or snow.

The driest month of the year is October with an average of 77 mm (3.0 in) of precipitation over 11.9 days.