Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| County | Population | Per capita income | Median household income | Median family income |
| --- | --- | --- | --- | --- |
| Alameda | 1494876.0 | $34,937 | $70,821 | $87,012 |
| Alpine | 1167.0 | $29,576 | $59,018 | $81,750 |
| Amador | 38244.0 | $28,030 | $56,180 | $69,521 |
| Butte | 219309.0 | $23,431 | $42,971 | $54,175 |
| Calaveras | 45794.0 | $28,667 | $55,256 | $67,253 |
| Colusa | 21297.0 | $21,271 | $49,558 | $55,063 |
| Contra Costa | 1037817.0 | $38,141 | $79,135 | $93,437 |
| Del Norte | 28561.0 | $19,247 | $37,588 | $52,076 |
| El Dorado | 179878.0 | $34,385 | $68,815 | $82,930 |
| Fresno | 920623.0 | $20,638 | $46,903 | $52,832 |
| Glenn | 28027.0 | $21,254 | $43,239 | $51,067 |
| Humboldt | 133585.0 | $24,209 | $40,376 | $52,317 |
| Imperial | 171343.0 | $16,593 | $39,402 | $43,769 |
| Inyo | 18457.0 | $27,532 | $49,571 | $68,204 |
| Kern | 829254.0 | $20,167 | $48,021 | $52,041 |
| Kings | 152335.0 | $18,296 | $48,838 | $51,932 |
| Lake | 64392.0 | $22,238 | $39,525 | $50,278 |
| Lassen | 35001.0 | $19,339 | $52,484 | $65,396 |
| Los Angeles | 9787747.0 | $27,954 | $56,266 | $62,595 |
| Madera | 149611.0 | $18,817 | $47,724 | $51,658 |
| Marin | 250666.0 | $54,605 | $89,605 | $113,826 |
| Mariposa | 18290.0 | $27,209 | $49,174 | $58,237 |
| Mendocino | 87525.0 | $23,585 | $44,527 | $54,083 |
| Merced | 253606.0 | $18,304 | $43,945 | $48,429 |
| Modoc | 9587.0 | $20,769 | $35,402 | $46,047 |
| Mono | 14016.0 | $28,789 | $60,469 | $78,079 |
| Monterey | 411385.0 | $25,508 | $59,737 | $63,523 |
| Napa | 135377.0 | $35,309 | $68,641 | $79,884 |
| Nevada | 98392.0 | $31,607 | $58,077 | $69,807 |
| Orange | 2989948.0 | $34,416 | $75,762 | $85,009 |
| Placer | 343554.0 | $35,583 | $74,645 | $90,446 |
| Plumas | 20192.0 | $28,104 | $44,151 | $53,128 |
| Riverside | 2154844.0 | $24,516 | $58,365 | $65,457 |
| Sacramento | 1408480.0 | $27,180 | $56,553 | $65,720 |
| San Benito | 54873.0 | $26,300 | $65,570 | $73,150 |
| San Bernardino | 2023452.0 | $21,932 | $55,853 | $61,525 |
| San Diego | 3060849.0 | $30,955 | $63,857 | $74,633 |
| San Francisco | 797983.0 | $46,777 | $72,947 | $87,329 |
| San Joaquin | 680277.0 | $22,857 | $53,764 | $60,725 |
| San Luis Obispo | 267871.0 | $30,204 | $58,630 | $74,841 |
| San Mateo | 711622.0 | $45,346 | $87,633 | $104,370 |
| Santa Barbara | 419793.0 | $30,330 | $61,896 | $71,695 |
| Santa Clara | 1762754.0 | $40,698 | $89,064 | $103,255 |
| Santa Cruz | 259402.0 | $32,975 | $66,030 | $80,572 |
| Shasta | 177231.0 | $23,691 | $44,058 | $55,250 |
| Sierra | 3277.0 | $26,137 | $50,308 | $56,469 |
| Siskiyou | 44687.0 | $22,335 | $37,865 | $47,632 |
| Solano | 411620.0 | $29,367 | $69,914 | $79,316 |
| Sonoma | 478551.0 | $33,119 | $64,343 | $78,227 |
| Stanislaus | 512469.0 | $21,820 | $50,671 | $56,996 |
| Sutter | 94192.0 | $22,464 | $50,010 | $54,737 |
| Tehama | 62985.0 | $20,689 | $38,753 | $46,805 |
| Trinity | 13711.0 | $22,551 | $37,672 | $46,980 |
| Tulare | 436234.0 | $17,986 | $43,550 | $46,881 |
| Tuolumne | 55736.0 | $26,084 | $47,359 | $59,710 |
| Ventura | 815745.0 | $32,740 | $76,728 | $86,321 |
| Yolo | 198889.0 | $28,631 | $57,920 | $74,991 |
Question:
What is the median household income of butte?
Answer:
$42,971