Flag states

70 registries with at least 10 reporting vessels.

A ship's flag is the state whose register it is entered in, and whose law governs it at sea. It rarely matches where the owner sits: the largest registries by tonnage are open registers that accept vessels from any country.

Flag is not reported directly in the MRV return. It is taken from the reported port of registry where that identifies a state unambiguously, and otherwise derived from the vessel's MMSI. Each vessel page states which method was used.

Flag state	Vessels	CO₂, latest (t)	Median EEOI
Liberia	3,725	28,979,977	11.2
Panama	3,277	21,411,268	10.5
Marshall Islands	3,176	19,732,888	9.0
Malta	1,703	16,494,350	12.8
Singapore	1,469	11,932,232	10.3
Hong Kong	1,340	12,009,232	9.1
Bahamas	1,024	10,522,540	13.5
Cyprus	695	5,900,655	19.2
Norway	649	4,985,296	19.1
Portugal	630	6,340,700	23.7
Antigua and Barbuda	611	2,903,389	41.7
Greece	534	5,991,421	7.0
Netherlands	427	3,070,792	46.2
Italy	391	7,541,544	37.6
Denmark	389	6,784,948	11.2
United Kingdom	328	3,341,227	12.2
China	279	1,373,479	10.1
Türkiye	226	1,627,580	26.9
Barbados	206	566,117	13.4
Russia	182	443,129	39.0
France	156	3,284,822	19.1
Isle of Man	155	958,424	12.8
Germany	135	2,353,188	19.8
Bermuda	131	3,086,346	17.9
Cayman Islands	121	793,013	13.7
Japan	112	1,077,694	40.4
Gibraltar	94	490,608	38.6
South Korea	93	511,825	41.6
Finland	91	1,980,604	58.9
Philippines	88	263,128	9.0
Belgium	88	631,731	9.2
Palau	85	182,686	19.6
Sweden	80	1,417,351	32.9
Spain	73	1,790,073	178.2
United States	72	826,036	33.0
Saudi Arabia	64	556,351	8.2
Saint Kitts and Nevis	63	126,658	20.2
India	56	240,026	8.7
Canada	53	222,692	39.4
Belize	49	84,376	15.3
Indonesia	40	219,513	19.5
Comoros	39	73,658	25.3
Vanuatu	37	65,025	24.7
Faroe Islands	36	297,481	54.2
Sierra Leone	35	130,422	16.1
Croatia	35	222,892	9.2
Luxembourg	33	291,089	17.5
Cook Islands	32	49,219	22.4
Saint Vincent and the Grenadines	31	75,444	21.8
Thailand	29	73,566	10.6
Kuwait	29	95,659	10.6
Switzerland	26	103,868	7.7
Brazil	25	159,406	12.5
Algeria	24	233,594	50.4
Latvia	24	111,348	43.1
Egypt	23	93,454	12.9
Bangladesh	22	74,766	7.9
Lithuania	21	389,773	74.6
Malaysia	20	203,717	14.9
Curaçao	20	106,927	82.2
Iran	19	143,519	40.5
Ireland	19	90,957	21.0
San Marino	17	36,858	15.9
Tuvalu	16	49,229	26.5
Togo	15	20,896	23.2
Morocco	14	103,010	46.0
Lebanon	13	14,617	199.2
Estonia	11	247,830	81.4
Taiwan	10	203,521	17.6
Libya	10	54,910	20.7

Registries with fewer than 10 vessels are not given their own page. Flag state is taken from the reported port of registry or, failing that, derived from the vessel's MMSI; each vessel page says which.