The Ilidža Municipality consists of the core of the city of Ilidža, as well as the outlying small neighborhoods (by size Hrasnica, Sokolovic Kolonija, Butmir, Kotorac), which although somewhat separated from the city center are still considered part of the city.

According to Sarajevo Canton statistics, the municipality of Ilidža has a total population of 47,654. According to Ilidža Municipality statistics, the population is slightly smaller, at about 44,454. Either way it is safe to assume that Ilidža has a population of about 46,000, give or take 1,500. Since the Sarajevo Canton statistics are far more detailed, and perhaps more recent, Wikipedia will take the 47,654 number as the official population.

Of these 47,654 residents, 38,695 are Bosniaks (81.2%), 5,806 are Serbs (12.2%), 3,010 are Croats (6.3%), and 143 people are identified as "others" (0.3%). Ilidža population accounts for a little under 12% of the population of Sarajevo Canton, and 2.1% of the Federation of Bosnia and Herzegovina.

Ilidžas population density is 332.3 inhabitants per km², which is incredibly low compared to the city of Sarajevo where the population density is 2470.1 inhabitants per km². This is largely due to the layout of Ilidža, described in the first paragraph above. Ilidžas population growth rate is 3.19%. If this rate continues, Ilidža should surpass the 100,000 mark in less than 25 years.

According to the Yugoslavian census of 1991, Ilidža had a pre-war population of 67,197. Of these, 28,836 were Bosniaks (43%), 24,982 were Serbs (37.2%), 6,901 were Croats (10.2%), and 5,126 identified themselves as Yugoslavs (7.6%), and 1,352 were classified as others (2%).