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County · code 32019

Lyon CountyNevada

Lyon County is a county in Nevada, with two seats in Dayton and Yerington, formed in 1861.

  • Founded1861
  • County seatDayton and Yerington
  • Named forNathaniel Lyon
  • Land area2,003 sq mi + 23 sq mi water
  • Population59,235 2020 Census
  • Parcels mapped35,341 checked 15 October 2026
Open the free map Click any parcel in Lyon County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

DouglasStoreyCarson CityMineralChurchillMono, CAWashoe Dayton and Yerington Census outline · seat marked

Where it is

Lyon on the map of Nevada

Nevada has 17 counties and county equivalents, each with its own records office. Shapes with a page are links.

Churchill CountyClark CountyDouglas CountyElko CountyEsmeralda CountyEureka CountyHumboldt CountyLander CountyLincoln CountyMineral CountyNye CountyPershing CountyStorey CountyWashoe CountyWhite Pine CountyCarson CityLyon County Lyon
Counties of Nevada · Lyon highlighted

History

Formed in 1861 from Churchill County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Lyon County was created by Nevada Territory from non-county area on November 25, 1861, and was named after Nathaniel Lyon. The county's boundaries changed several times over the following decades, gaining territory from Churchill, Esmeralda, and Mineral counties, and exchanging land with Washoe and Douglas counties.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1861
    Lyon County created Lyon created by Nevada Territory from non-county area. Churchill not fully organized, attached to Lyon for administrative and judicial purposes.
    from Churchill
    · Nev. Terr. Stats. 1861, 1st sess., ch. 24, sec. 5/p. 51 and p. 291
  2. 1864
    Gained territory Lyon gained from Churchill.
    from Churchill
    · Nev. Terr. Stats. 1864, 3d sess., ch. 109/p. 148
  3. 1864
    Became part of Nevada Lyon became a county in the state of Nevada. · U.S. Stat., vol. 13, ch. 36[1864]/pp. 30-32 and proc. 22/p. 749; Van Zandt, 158-160
  4. 1869
    Lost territory Lyon lost to Churchill.
    to Churchill
    · Nev. Stats. 1869, 4th sess., ch. 41/p. 88
  5. 1883
    Gained territory Lyon gained from Esmeralda.
    from Esmeralda
    · Nev. Stats. 1883, 11th sess., ch. 74/p. 99
Show all 15 changes (10 more)
  1. 1861
    Lyon County created Lyon created by Nevada Territory from non-county area. Churchill not fully organized, attached to Lyon for administrative and judicial purposes.
    from Churchill
    · Nev. Terr. Stats. 1861, 1st sess., ch. 24, sec. 5/p. 51 and p. 291
  2. 1864
    Changed Churchill fully organized, detached from Lyon.
    Churchill
    · Nev. Terr. Stats. 1864, 3d sess., ch. 62/pp. 86-88
  3. 1864
    Gained territory Lyon gained from Churchill.
    from Churchill
    · Nev. Terr. Stats. 1864, 3d sess., ch. 109/p. 148
  4. 1864
    Became part of Nevada Lyon became a county in the state of Nevada. · U.S. Stat., vol. 13, ch. 36[1864]/pp. 30-32 and proc. 22/p. 749; Van Zandt, 158-160
  5. 1869
    Lost territory Lyon lost to Churchill.
    to Churchill
    · Nev. Stats. 1869, 4th sess., ch. 41/p. 88
  6. 1883
    Gained territory Lyon gained from Esmeralda.
    from Esmeralda
    · Nev. Stats. 1883, 11th sess., ch. 74/p. 99
  7. 1897
    Changed Legislature authorized a referendum on the question: "Shall Storey, Ormsby, Lyon, and Douglas be consolidated into one county?" Referendum was defeated at the 1898 general election by all counties except Ormsby (extinct), and the consolidation did not take effect.
    StoreyOrmsbyDouglas
    · Nev. Stats. 1897, 18th sess., ch. 94/p. 110; Mottaz, 43
  8. 1899
    Boundary clarified Lyon boundaries were redefined to include the "territory over which Lyon has exercised jurisdiction for the period of five years last past." Results were: Lyon gained from Douglas, and Lyon boundary with Storey was in dispute.
    with Douglaswith Storeyno change
    · Nev. Stats. 1899, 19th sess., ch. 30/p. 41; Mottaz, 43
  9. 1911
    Changed During the July 1911 term, the Nevada Supreme Court found in favor of Lyon regarding the correct location of its boundary with Storey (no change).
    Storey
    · "Lyon v. Storey" in Nev. Rpts., 34: 243-264
  10. 1933
    Gained territory Lyon gained from Mineral.
    from Mineral
    · Nev. Stats. 1933, 36th sess., ch. 193/pp. 335-339; Nev. Stats. 1935, 37th sess., ch. 166/p. 361
  11. 1951
    Changed Churchill boundary with Lyon was adjusted near town of Wadsworth.
    Churchill
    · Nev. Stats. 1951, 45th sess., ch. 288/p. 440
  12. 1965
    Exchanged territory Lyon exchanged with Washoe when boundary was placed on public land survey lines.
    with Washoe
    · Nev. Stats. 1965, 53d sess., ch. 192/pp. 337-338
  13. 1967
    Exchanged territory Lyon exchanged with Douglas.
    with Douglas
    · Nev. Stats. 1967, 54th sess., ch. 350/pp. 972-974
  14. 1969
    Exchanged territory Lyon exchanged with Churchill.
    with Churchill
    · Nev. Stats. 1969, 55th sess., ch. 590/pp. 1112-1114
  15. 1969
    Boundary clarified Lyon boundaries were redefined (no change).
    no change
    · Nev. Stats. 1969, 55th sess., ch. 213/p. 320

Land and parcels

What the maps cover in Lyon

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Lyon by the Census

Population
59,235 2020 Census count
Housing units
24,401 2020 Census count
Land area
2,003 square miles
Water area
23 square miles
People per sq mi
30 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

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Questions

Common questions about Lyon County

When was Lyon County founded?
Lyon County was founded in 1861, formed from Churchill County, and named after Nathaniel Lyon.
What is the county seat of Lyon County?
The county seat of Lyon County is Dayton and Yerington.
Is there an online parcel map for Lyon County?
Yes. Lyon County publishes a parcel map of 35,341 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Lyon County's boundary or name changed?
Lyon County was created in 1861 from Churchill County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Churchill County, Douglas County and Esmeralda County.
Who issues building permits in Lyon County?
The county's page on building permits: Encroachment Permit. Inside a city or town, ask that city first.
Who issues septic and well permits in Lyon County?
The county's page on septic systems and wells: Behavioral Health.
Is my lot in a flood zone?
We do not have flood maps for Lyon County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door