Updated July 2026
Child Support in Sierra Nevada, California
A plain-language guide to child support across Sierra Nevada, from California's statewide guideline formula to the forms you file at your county's Superior Court, the local child support agency, and how to estimate your number and prepare your paperwork without hiring an attorney.
This page covers child support in 9 of California's smaller Sierra Nevada and eastern Sierra counties: the Gold Country foothill counties of Nevada, Tuolumne, Calaveras, Amador, Mariposa, and Sierra, the high mountain county of Alpine, and Inyo and Mono along the eastern escarpment near Bishop, Mammoth Lakes, and Bridgeport. Each keeps its own Superior Court and Local Child Support Agency, and each applies the exact same statewide rules as every other California county.
California sets child support with a single statewide guideline formula (Family Code section 4055), based mainly on both parents' net disposable incomes and the timeshare, the percentage of time the child spends with each parent. The guideline amount is presumed correct in every county on this page. You can reach a support order two ways: by filing a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150) in a divorce, parentage, or custody case, or by asking the county's Local Child Support Agency, part of the California Department of Child Support Services, to open and enforce a case.
Because the result turns on the income and timeshare figures you report, estimating early is worth doing. Try our free California child support calculator before you file. What differs locally in a mountain county is mostly administrative: most of these counties route filings through a single courthouse in the county seat, mountain roads and winter weather can add travel time, and the Local Child Support Agency office can have more limited hours than a metro county, especially in a county as small as Alpine or Sierra. Confirm current locations and hours using the official California Courts court finder before you file or travel.
Child support in California generally continues until the child turns 18, or 19 if the child is still a full-time high school student living at home and not self-supporting, and either parent can ask the court to modify support when income or timeshare changes meaningfully. This applies the same way in every county listed here.
Estimate your Sierra Nevada child support
California uses one statewide guideline formula, so you can get an estimate for a case anywhere in Sierra Nevada with our free calculator before you file.
Open the California guideline child support calculatorChild support agencies and courts by county in Sierra Nevada
Nevada County
Nevada County's family courts and local child support agency serve families across a wide area, from Grass Valley and Nevada City, the county seat, up to Truckee near Lake Tahoe, through the Superior Court of California, County of Nevada.
Tuolumne County
Tuolumne County serves families in Sonora, the county seat, and Twain Harte through the Superior Court of California, County of Tuolumne and its Local Child Support Agency.
Calaveras County
Calaveras County's family courts and Local Child Support Agency handle support matters for Angels Camp and San Andreas, the county seat, through the Superior Court of California, County of Calaveras.
Amador County
Amador County serves families in Jackson, the county seat, Ione, and Sutter Creek through the Superior Court of California, County of Amador and its Local Child Support Agency.
Mariposa County
Mariposa County's family courts and Local Child Support Agency serve families in and around Mariposa, the county seat and the county's main population center, through the Superior Court of California, County of Mariposa.
Sierra County
Sierra County serves families in Loyalton and Downieville, the county seat, through the Superior Court of California, County of Sierra and its Local Child Support Agency.
Alpine County
Alpine County, the least populous county in California, serves families in and around Markleeville, its county seat, through the Superior Court of California, County of Alpine. Given the county's very small size, self-help and agency staffing can be more limited than elsewhere, so plan ahead.
Inyo County
Inyo County's family courts and Local Child Support Agency serve families in Bishop, Lone Pine, and Independence, the county seat, through the Superior Court of California, County of Inyo.
Mono County
Mono County serves families in Mammoth Lakes and Bridgeport, the county seat, through the Superior Court of California, County of Mono and its Local Child Support Agency.
Find your county's Superior Court (official California Courts finder)
How child support is calculated in California
California sets child support with a statewide uniform guideline (Family Code section 4055) that applies the same way in every county in Sierra Nevada as everywhere else. The formula is based mainly on two things:
- Both parents' net disposable incomes.
- The percentage of time the child spends with each parent (the timeshare).
The guideline amount is presumed to be correct, and courts use a calculator to run the numbers. Because the result depends on accurate income, the Income and Expense Declaration (Form FL-150) you file is what drives your number.
Guides and tools for your child support case
Sierra Nevada Child Support FAQs
How is child support calculated in these Sierra Nevada counties?
Every county on this page uses California's statewide guideline formula (Family Code section 4055), based mainly on both parents' net disposable incomes and the percentage of time the child spends with each parent. The guideline amount is presumed correct, and you can estimate your number with our free California guideline child support calculator before you file.
Can the Local Child Support Agency help with my case in a county like Amador or Inyo?
Yes. Each of these counties has a Local Child Support Agency, part of the California Department of Child Support Services, that can establish parentage if needed, set a guideline order, and collect and enforce payments, often at no cost to the parents. You can also file on your own with a Request for Order (Form FL-300).
How long does child support last in these counties?
Under California law, which applies the same way in every county on this page, child support generally continues until the child turns 18, or 19 if the child is still a full-time high school student living at home and not self-supporting. Either parent can request a modification when income or timeshare changes meaningfully.
Can I handle a child support filing without a lawyer in a Sierra Nevada county?
Yes. California allows self-represented parents, and each of these counties offers self-help resources for people handling their own support paperwork. A document preparation service like Virdix can help you complete the required Judicial Council forms accurately, though it does not give legal advice or represent you in court.
This page is general information about California child support procedure in Sierra Nevada, not legal advice for your situation. The calculator provides an estimate only, and the court determines the actual guideline amount. Court locations, agency offices, and filing details change; always confirm current details with your county's Superior Court, its Local Child Support Agency, or the official California Courts self-help resources. Virdix is a document preparation service, not a law firm, and is not a substitute for an attorney.