Once states have received the total apportionment allocation, state appointed or elected representatives can begin redistricting. California currently has 53 United States Representatives in the House and 120 state legislatures; each of those representatives is elected by district. The federal government mandates that those districts be re-evaluated every ten years after the Census, be nearly equal in size, and not discriminate on the basis of race or ethnicity.
The process of redistricting varies by state. In most states the state legislators redraw the boundaries, in some states an independent body redraw the boundaries, and some states do not redistrict at all because they only require one representative. In California, an independent redistricting commission of California residents draws the districts. This commission is in charge of drawing congressional and state legislative lines.