Question: What is the average income in the county where the settlement of Forbes was located?

full_context: Document 1: David, California: David is a former settlement in Butte County, California. It was located north-northwest of Berry Creek on the Western Pacific Railroad, at an elevation of 1014 feet (309 m). David still appeared on maps as of 1948.
Document 2: Forbes, California: Forbes is a former settlement in Marin County, California. It was located on the Northwestern Pacific Railroad south-southeast of downtown Novato, at an elevation of 33 feet (10 m). Forbes still appeared on maps as of 1914.
Document 3: Tanoak, California: Tanoak is a former settlement in Humboldt County, California. It was located on the Northwestern Pacific Railroad east of Weott, at an elevation of 207 feet (63 m). It still appeared on maps as of 1949.
Document 4: Household income in the United States: One key measure is the real median level, meaning half of households have income above that level and half below, adjusted for inflation. According to the Census, this measure was $59,039 in 2016, a record high. This was the largest two year increase percentage increase on record.
Document 5: Lorraine, California: Lorraine is a former settlement in Butte County, California., it is now inundated by the Thermalito Afterbay reservoir. It lay at an elevation of 138 feet (42 m). Lorraine still appeared on maps as of 1952. It was located north-northeast of Biggs on the Sacramento Northern Railroad.
Document 6: Household income in the United States: One key measure is the real median level, meaning half of households have income above that level and half below, adjusted for inflation. According to the Census, this measure was $59,039 in 2016, a record high. This was the largest two year percentage increase on record.
Document 7: Buckingham County, Virginia: The median income for a household in the county was $36,378. Males had a median income of $36,420 versus $32,327 for females. The per capita income for the county was $16,938.  About 21.1% of the population were below the poverty line.
Document 8: Fresno County, California: The median income for a household in the county was $34,725, and the median income for a family was $38,455. Males had a median income of $33,375 versus $26,501 for females. The per capita income for the county was $15,495. About 17.6% of families and 22.9% of the population were below the poverty line, including 31.7% of those under age 18 and 9.9% of those age 65 or over.
Document 9: Shafter, Marin County, California: Shafter is an unincorporated community in Marin County, California. It is located on the Northwestern Pacific Railroad southwest of downtown Novato, at an elevation of 167 feet (51 m).
Document 10: South Fork, Butte County, California: South Fork is a former settlement in Butte County, California, USA. It lay at an elevation of 1375 feet (419 m). It still appeared on maps as of 1947, and was inundated by Lake Oroville. South Fork was located east-southeast of Bidwell's Bar on the Feather River.
Document 11: Miller, California: Miller is a former settlement in Marin County, California. It was located on the Northwestern Pacific Railroad south-southeast of downtown Novato, at an elevation of 23 feet (7 m). Miller still appeared on maps as of 1914.
Document 12: Hampshire County, West Virginia: The median income for a household in the county was $31,666, and the median income for a family was $37,616. Males had a median income of $28,884 versus $19,945 for females. The per capita income for the county was $14,851. About 12.90% of families and 16.30% of the population were below the poverty line, including 22.70% of those under age 18 and 13.10% of those age 65 or over.
Document 13: Detroit: Oakland County in Metro Detroit, once rated amongst the wealthiest US counties per household, is no longer shown in the top 25 listing of Forbes magazine. But internal county statistical methods – based on measuring per capita income for counties with more than one million residents – show that Oakland is still within the top 12, slipping from the 4th-most affluent such county in the U.S. in 2004 to 11th-most affluent in 2009. Detroit dominates Wayne County, which has an average household income of about $38,000, compared to Oakland County's $62,000.
Document 14: Lewis County, West Virginia: The median income for a household in the county was $27,066, and the median income for a family was $32,431. Males had a median income of $27,906 versus $18,733 for females. The per capita income for the county was $13,933. 19.90% of the population and 16.30% of families were below the poverty line. 27.00% of those under the age of 18 and 11.20% of those 65 and older were living below the poverty line.
Document 15: List of highest-income counties in the United States: Rank County State Median Household Income Loudoun County Virginia $134,464 Howard County Maryland $120,941 Fairfax County Virginia $115,717 Hunterdon County New Jersey $113,684 5 Santa Clara County California $111,069 6 Arlington County Virginia $110,388 7 Douglas County Colorado $109,292 8 San Mateo County California $108,627 9 Morris County New Jersey $106,985 10 Williamson County Tennessee $106,054 11 Nassau County New York $105,870 12 Somerset County New Jersey $104,478 13 Marin County California $103,845 14 San Francisco County California $103,801 15 Delaware County Ohio $101,693 16 Forsyth County Georgia $100,909 17 Montgomery County Maryland $99,763 18 Calvert County Maryland $98,732 19 Prince William County Virginia $97,986 20 Stafford County Virginia $97,484 21 Putnam County New York $96,992 22 Anne Arundel County Maryland $96,483 23 Charles County Maryland $95,735 24 Rockwall County Texas $95,731 25 Middlesex County Massachusetts $95,249
ground_truth: $103,845
sub_queries: Forbes >> located in the administrative territorial entity Answer: Marin County
what is the average income in Marin County Answer: $103,845