[3] Perly-Certoux has an area, as of 2009[update], of 2.53 square kilometers (0.98 sq mi).

Of the rest of the land, 0.68 km2 (0.26 sq mi) or 26.9% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.4% is either rivers or lakes.

while parks, green belts and sports fields made up 2.0%.

[4] The municipality is located on the left bank of the Rhone river.

[8] Most of the population (as of 2000[update]) speaks French (2,403 or 86.4%), with Italian being second most common (89 or 3.2%) and German being third (84 or 3.0%).

The greatest number of single family homes (38) were built between 1971 and 1980.

[8] The historical population is given in the following chart:[3][12] In the 2007 federal election the most popular party was the SVP which received 21.6% of the vote.

In the federal election, a total of 727 votes were cast, and the voter turnout was 44.2%.

[13] In the 2009 Grand Conseil election, there were a total of 1,636 registered voters of which 654 (40.0%) voted.

The most popular party in the municipality for this election was the Libéral with 17.1% of the ballots.

In the canton-wide election they received the highest proportion of votes.

[14] For the 2009 Conseil d'État election, there were a total of 1,628 registered voters of which 749 (46.0%) voted.

[8] There were 1,557 residents of the municipality who were employed in some capacity, of which females made up 45.0% of the workforce.

In the tertiary sector; 185 or 31.5% were in wholesale or retail sales or the repair of motor vehicles, 11 or 1.9% were in the movement and storage of goods, 29 or 4.9% were in a hotel or restaurant, 176 or 29.9% were in the information industry, 4 or 0.7% were the insurance or financial industry, 123 or 20.9% were technical professionals or scientists, 22 or 3.7% were in education and 14 or 2.4% were in health care.

[8] From the 2000 census[update], 1,293 or 46.5% were Roman Catholic, while 506 or 18.2% belonged to the Swiss Reformed Church.

The education system in the Canton of Geneva allows young children to attend two years of non-obligatory Kindergarten.

The canton's school system provides two years of non-mandatory kindergarten and requires students to attend six years of primary school, with some of the children attending smaller, specialized classes.

There were 84 lower secondary students who attended school in Perly-Certoux.