Mahiari is located at 22.59°N 88.24°E / 22.59; 88.24. It has an average elevation of 6 m (20 ft).
Mahiari is adjacent to Andul and the two together are referred to as Andul–Mouri (also spelt Andul–Mowri).PIN for Andul–Mouri is 711302 and for Andul Road is 711103.
As per 2011 Census of India Mahiari had a total population of 18,223 of which 9,209 (51%) were males and 9,014 (49%) were females. Population below 6 years was 1,634. The total number of literates in Mahiari was 15,055 (90.75 % of the population over 6 years).
Mahiari was part of Kolkata Urban Agglomeration in 2011 census.
As of 2001 India census, Mahiari had a population of 15,422. Males constitute 51% of the population and females 49%. Mahiari has an average literacy rate of 77%, higher than the national average of 59.5%: male literacy is 81%, and female literacy is 73%. In Mahiari, 10% of the population is under 6 years of age.
Mahiari houses several industrial activity especially in the northern areas near Alampur. Leading industries are steel, engineering and instrumentation, motor vehicle, jewellery, dairy etc. Previously there was a large operation of Frigerio Conserva Allana Ltd at the southern part near Mourigram railway station. "Kamal Nursery" and "The Indian Nursery" two of the most famous names in the Indian horticulture industry are situated at Mahiari. Howrah Flower Growers' Association organize flower exhibition at Kamal Nursery every year. There are a number of markets including that of Mouri Bazar and Khatir Bazar. Mahiari has its renowned traditional industry of wooden furniture that caters clients from all over Kolkata and Howrah.
Mahiari of Howrah District is located about 3 km towards the north of Sankrail. Santragachi is to the north. Howrah and Kolkata lie within 15 km from Mahiari.
National Highway 6 passes nearby this town.
Howrah Bridge, Belur Math, Indian Botanic Garden, Bally Bridge and Santragachi Jheel are some of the tourist options in the neighborhood. Netaji Subhash Chandra Bose International Airport (25 km) and Howrah Railway Station(10 km),Santragachi Railway Station, Andul bus stand, Khatir bazar bus stand and Maurigram Railway Station serves Mahiari.
The Shiva temples, named Panchananda and Sasaneswar, established by the Kunduchoudhury family, are more than a century old.
There is a 165 feet (50 m) high semaphore telegraphy tower.