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The states of Nevada and Utah, also originally part of Alta California, also use that line for their northern boundaries. The southern boundary, between California and Mexico, was established by the Treaty of Guadalupe Hidalgo that ended the Mexican–American War in 1848. The line is about 30 miles (48 km) north of the former Alta California ...
ZCTAs are generalized area representations of the United States Postal Service (USPS) ZIP code service areas, but are not the same as ZIP codes. Individual USPS ZIP codes can cross state, place, county, census tract, census block group and census block boundaries, so the Census Bureau asserts that "there is no correlation between ZIP codes and ...
The new Mexico–United States border was established slightly to the north of the previous Alta-Baja border, and the terms Las Californias and Alta California were no longer formally used. The areas acquired by the U.S. remained under military authority, pending creation of civilian government through territorial designation and/or statehood.
The Adams–Onís Treaty of 1819, between the United States and Spain, established the northern limit of Alta California at latitude 42°N, which remains the boundary between the states of California, Nevada and Utah (to the south) and Oregon and Idaho (to the north) to this day. Mexico won independence in 1821, and Alta California became a ...
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...
There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
San Francisco Bay Area. East Bay. Oakland–Alameda County; Tri-Valley Area. Amador Valley; Livermore Valley; San Ramon Valley; Lamorinda; North Bay. Marin County
Like most states, California is divided into counties, of which there are 58 (including San Francisco) [note 1] covering the entire state. Most urbanized areas are incorporated as cities, [note 2] though not all of California is within the boundaries of a city. School districts, which are independent of cities and counties, handle public education.