Directory · Idaho · Inland marine

Who writes inland marine in Idaho

Top insurer groups from the NAIC market share report; the state's list carries no lines of authority.

Liberty Mutual Group wrote the most inland marine in Idaho in 2025, $38.8M and 18.9% of the state's premium; the top five groups hold 40%. Idaho's company list doesn't say which lines each company is licensed for, so the ranking below is the NAIC's top 10 groups; every licensed company is on the Idaho page.

By Sam Alishahi, independent insurance broker · All lines in Idaho

Top 10 · NAIC table: 09.1 - Inland Marine

The insurer groups that write the most inland marine in Idaho

Top 10 insurer groups by direct premium written in 2025, from the NAIC's Market Share Reports for Property/Casualty Groups and Companies by State. A group is the parent and its insurance companies together; share is the group's part of the state total for the line; loss ratio is losses incurred over premium earned.

#	Insurer group	Premium written	Share	Loss ratio	Member companies here
1	Liberty Mutual Group	$38.8M	18.94%	47%	Safeco Insurance Company of America, Liberty Insurance Underwriters, Inc., Liberty Mutual Fire Insurance Company, Liberty County Mutual Insurance Company
2	Farm Bureau Group	$15.6M	7.59%	42%	Western Community Insurance Company, Farm Bureau Insurance Company of Idaho
3	Allianz Insurance Group	$10.9M	5.30%	21%	Allianz Global Risks US Insurance Company, Jefferson Insurance Company, Fireman's Fund Insurance Company, AGCS Marine Insurance Company
4	Zurich Insurance Group	$9.1M	4.46%	24%	Zurich American Insurance Company, Rural Community Insurance Company, American Zurich Insurance Company, American Guarantee and Liability Insurance Company
5	Fm Group	$8.4M	4.13%	0%	Factory Mutual Insurance Company, Affiliated F M Insurance Company, Appalachian Insurance Company
6	Cna Insurance Group	$8.3M	4.04%	42%	Continental Casualty Company, Continental Insurance Company, (The), American Casualty Company of Reading, Pennsylvania, National Fire Insurance Company of Hartford
7	Minnesota Mutual Group	$7.1M	3.45%	37%	Securian Casualty Company, Securian Specialty Lines, Inc.
8	American International Group	$6.7M	3.26%	13%	National Union Fire Insurance Company of Pittsburgh, Pennsylvania, AIG Property Casualty Company, Lexington Insurance Company, AIU Insurance Company
9	Chubb Ltd Group	$6.0M	2.93%	17%	Federal Insurance Company, Ace American Insurance Company, Ace Property and Casualty Insurance Company, Chubb Lloyd's Insurance Company of Texas
10	Old Republic Group	$5.8M	2.86%	23%	Old Republic Insurance Company, Great West Casualty Company, BITCO General Insurance Corporation, Pennsylvania Manufacturers' Association Insurance Company

Turned down?

Last resort for inland marine in Idaho

Last resort	Lines	Where	How to get in
Surplus lines and Lloyd's open market	all	all states, under each state's diligent-search rules	Through surplus lines wholesalers; commercial property and liability have no guaranteed plan, so this is their last step	Source

Method and source

Source: the Idaho insurance regulator company list, read 2026-10-18 and the surplus lines list. Admitted = every company licensed in Idaho per the DOI 2024 Annual Report roster (pp. 42-76), all four sections kept with 'type' = Health / Life & Annuity / Property & Casualty / Title so the merge can filter; 'since' = IDAHO LICENSE DATE; 'lines' = LINE(S) OF BUSINESS split on ';' (duplicates removed). Counts by type: {'Health': 23, 'Life & Annuity': 419, 'Property & Casualty': 870, 'Title': 18}. Domicile 'Canada' mapped to CN; one row (80659) has no domicile printed. Companies withdrawn in 2024 (report p.35) are not in the roster. Surplus = SLA of Idaho eligible list: no domicile or eligibility date on the page; alien insurers carry an AA- import code in 'import_code' and naic '' (two AA- rows are labelled Foreign on the page but flagged alien here); DECLO ASSURANCE CORPORATION shows code 'ID 4862' (not a NAIC code). "Premium" is direct premium written in the state for the year shown; "share" is that company's part of the state total for the line. A company can be licensed for a line and write none of it, and a surplus lines insurer can write a line without a state license for it.

Open to use. Cite "Alishahi Insurance insurance company directory" and link here. CSV · JSON.

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