Simi Valley, California

The same ground, surveyed 79 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1900 1979

Buildings and businesses the archive holds for this place. Each opens its own page, with the source record it came from.

On the National Register 1 record

• Grandma Prisbrey's Bottle Villagelisted 1996

Simi Valley grew from 124,237 to 126,356 between 2010 and 2020. These are the recorded population figures Wikidata holds for this place, reached through the Geographic Names Information System number this page is keyed on rather than by name, so they belong to this place and not to another of the same name. Most are census counts, but not all are: an early figure may be a founding or settlement estimate, and an estimate published within five years of a census is left out. The change column is computed, and is left blank where more than 20 years separate a figure from the one before it, because a gap that long is not a change between two counts.

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1900 USGS Piru quadrangle1:62500
• 1903 USGS Camulos quadrangle1:125000, 5 printings
• 1921 USGS Piru quadrangle1:62500, 4 printings
• 1941 USGS Piru quadrangle1:62500
• 1949 USGS Los Angeles quadrangle1:250000, 2 printings
• 1951 USGS Simi quadrangle1:24000, 5 printings
• 1951 USGS Simi Valley West quadrangle1:24000
• 1955 USGS Los Angeles quadrangle1:250000
• 1959 USGS Los Angeles quadrangle1:250000, 3 printings
• 1966 USGS Los Angeles quadrangle1:250000
• 1975 USGS Los Angeles quadrangle1:250000, 2 printings
• 1979 USGS Los Angeles quadrangle1:100000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 42 fires within 5 miles of Simi Valley between 1994 and 2020, burning about 2,481 acres in total. 2 started naturally. 3 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Settlements close enough to share some of these fires:

• Strathearn
• Community Center
• Moorpark
• Virginia Colony
• Mountclef Village
• Santa Susana Knolls

Every fire recorded in Ventura County

Regional context, not property-specific evidence. The federal mineral resources record lists 6 workings within 5 miles of Simi Valley: 5 past producers, 1 prospect. None of them still produces. What was taken out: Sand and Gravel, Construction, Copper, Nickel, Nickel, Copper. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Ventura County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 1661450. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.