Regional Codes ...
For statistical purposes, the US Census Bureau has divided the country into four Regions. Arroyo Seco is located in Region #4 (the West Region).
In turn, the US Census Bureau has further divided each Region into Divisions. Arroyo Seco is located in Division #9 (the Pacific Division).
The Office of Management and Budget (OMB) has created ten Federal Regions. Arroyo Seco is located in Region IX (Region 9).
Referenced GNIS Records ...
GNIS ID #238768 (Name of Record: Arroyo Seco)
A political division formed for administrative purposes (such as a borough, county, incorporated place, parish, town or township).
A 'civil' record may have a corresponding 'census' or 'populated place' record. The information contained in the 'civil' record applies only to the class and should not be confused with either the 'census' and 'populated place' classes.
Map Name: Paraiso Springs
Lat: 36.3269104 Lon: -121.2779822 [Map]
Elev: 95 ft.