state legislatures
Each state has two senators, but the number of congressmen are determined by population based on census figures. For instance, Mississippi had five congressional districts from 1960 to 2000. But one district was abolished when the 2000 census showed that the state had lost population.
The number of congressional districts per state is determined every 10 years, after the census.
why are some districts redrawn after a census? Districts are re-drawn for two reasons. The first is if population shifts change the number of Congressional representatives for a state. If the population decreases sufficiently enough relative to other states (which may mean its population has grown, but not as rapidly as other states) or if it increases sufficiently compared to other states, then it may lose or gain one or more representatives in Congress. If that happens the state's area is re-divided into the correct number of districts, with an attempt made to keep the populations of the districts fairly even. But re-districting can be done every 10 years following the Federal census, and often (not always) the legislative body within the state has the power to draw district boundaries. Whatever party is in power may choose to re-draw boundaries to make their position better by increasing the number of "safe" districts (or de-stabilizing the district of a strong opponent). "Gerrymandering" has a very long and "distinguished" history.
How often must legislative redistricting be done in Illinois?
The U.S. Census is used to tell which states grew to get representation and which states lost population and therefor lose some representatives
a decennial (ten-year) census.
Compact, contiguous, and about the same in population
It is required that legislative and congressional districts have roughly equal populations. In the United States, congressional seats are redistributed after each decennial census.
Legislative districts at the same level, such as state legislative districts, are typically organized based on population to ensure equal representation. Each district is drawn to encompass roughly the same number of residents, adhering to the principle of "one person, one vote." Redistricting occurs periodically, often following the decennial census, to account for population shifts and maintain equitable representation. Additionally, districts must comply with legal requirements, including considerations for racial and ethnic fairness, to prevent gerrymandering.
population levels determine number of districts
An Illinois legislative district is a designated geographic area represented by a member of the Illinois General Assembly, which includes the Illinois House of Representatives and the Illinois Senate. These districts are drawn to ensure equal representation in the state's legislature, with the House districts typically containing around 108,000 residents and Senate districts covering approximately twice that population. The boundaries of these districts are redrawn every ten years following the census to reflect changes in population and demographics.
Congressional districts are redrawn every 10 years following the national census. This process is called redistricting, and the U.S. Constitution requires a census every 10 years for the purpose of redistricting Congressional districts.
Gerrymandering applies to electoral districts, specifically legislative districts used for state and federal elections, such as congressional and state assembly districts. It involves manipulating the boundaries of these districts to favor one political party over another, which can occur in any area where districts are drawn, including urban, suburban, and rural regions. The specific districts affected vary by state and depend on the redistricting process, which typically occurs every ten years after the census.
Every 10 years after a census.
Each state has two senators, but the number of congressmen are determined by population based on census figures. For instance, Mississippi had five congressional districts from 1960 to 2000. But one district was abolished when the 2000 census showed that the state had lost population.
Based on the 2010 Census, there are 18 members of the U.S. House of Representatives from Pennsylvania. The Pennsylvania House of Representatives consists of 203 members, elected for two-year terms from legislative districts across the state.
as per census 2011 there are 640 districts in India.