| Łomża County | |
| Native Name: | Powiat łomżyński |
| Total Type: | Total |
| Image Map1: | Powiat lomzynski.png |
| Map Caption1: | Division into gminas |
| Subdivision Type: | Country |
| Area Total Km2: | 1353.93 |
| Population Total: | 50,914 |
| Population As Of: | 2019 |
| Population Density Km2: | auto |
| Population Urban: | 3781 |
| Population Blank1 Title: | Rural |
| Population Blank1: | 47133 |
| Coor Pinpoint: | Łomża |
| Coordinates: | 53.1667°N 27°W |
| Parts Type: | Gminas |
| Parts: | Total 9 |
| Blank Info: | BLM |
| Website: | http://www.powiatlomzynski.pl |
Łomża County (Polish: powiat łomżyński) is a unit of territorial administration and local government (powiat) in Podlaskie Voivodeship, north-eastern Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat is the city of Łomża, although the city is not part of the county (it constitutes a separate city county). The only towns in Łomża County are Nowogród, which lies 160NaN0 north-west of Łomża, and Jedwabne, 200NaN0 north-east of Łomża.
The county covers an area of 1353.93km2. As of 2019 its total population is 50,914, out of which the population of Nowogród is 2,155, that of Jedwabne is 1,626, and the rural population is 47,133.[1]
Apart from the city of Łomża, Łomża County is also bordered by Kolno County and Grajewo County to the north, Mońki County and Białystok County to the east, Zambrów County and Ostrów Mazowiecka County to the south, and Ostrołęka County to the west.
The county is subdivided into nine gminas (two urban-rural and seven rural). These are listed in the following table, in descending order of population.
| Gmina | Type | Area (km2) | Population (2019) | Seat |
| Gmina Łomża | rural | 207.4 | 11,099 | Łomża * |
| Gmina Piątnica | rural | 218.7 | 10,648 | Piątnica |
| Gmina Śniadowo | rural | 162.6 | 5,350 | Śniadowo |
| Gmina Jedwabne | urban-rural | 159.4 | 5,299 | Jedwabne |
| Gmina Miastkowo | rural | 114.8 | 4,225 | Miastkowo |
| Gmina Zbójna | rural | 185.8 | 4,189 | Zbójna |
| Gmina Nowogród | urban-rural | 101.0 | 4,013 | Nowogród |
| Gmina Wizna | rural | 133.1 | 4,008 | Wizna |
| Gmina Przytuły | rural | 71.2 | 2,083 | Przytuły |
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