Places in America where a immigrant group is associated with

[It’s so Joever]

Guyanese: New York NY
Haitians: Miami FL
Hondurans: New Orleans LA
Hungarians: Cleveland OH
Indians: Jersey City NJ
Iranians: Los Angeles CA
Iraqis: Chicago IL
Irish: Boston MA
Italians: New York NY
Jamaicans: New York NY
Japanese: Honolulu HI
Jordanians: Paterson NJ
Laotians (mainly the Hmong who are often but not always from Laos): Minneapolis MN
Lebanese: Dearborn MI
Liberians: Brooklyn Park MN
Lithuanians: Chicago IL

[It’s so Joever]

Malaysians: New York NY
Malians: New York NY
Maltese: New York NY
Marshallese: Springdale AR
Mexicans: Los Angeles CA
Mongolians: Denver CO
Montenegrins: Anchorage AK
Moroccans: Jacksonville FL
Burmese: Minneapolis MN
Nepalese: Somerville MA
Dutch: Holland MI
Nicaraguans: Sweetwater FL
Koreans: Los Angeles CA
Norwegians: Fargo, ND

[thebeloitmoderate]

For example In New York City since the city has always been a melting pot of immigrants since it's founding by the Dutch I'll give you some great examples.
Jamaicans: Most of them live in Brooklyn especially the Crown Heights, Flushing, and some in East New York, while in Queens most of them live in the Jamaica Neighborhood, as well as St Albans and southeast Queens, there is a sizable Jamaican population in the North Bronx.
Puerto Ricans: technically US citizens since it has been a territory of America. Most Stateside Puerto ricans in New York City live in the South Bronx, alongside Bushwick in Brooklyn, and East Harlem although Dominicans and Mexicans have been replacing Puerto Ricans as the dominant Hispanic group in East Harlem.
Italians: One of the very first sizable immigrant groups to come to New York city during the late 1800s to early 20th century, it has been associated with the city in a more famous way than some of the other groups I listed especially with people such as Robert De Niro, Rudy Giuliani pre 2020, Frank Sinatra (Jersey born though) being icons of New York City. The little Italy neighborhoods in Manhattan and the Bronx are now long gone as the former is mostly Asian and hipster, while the second one is predominantly Black and Hispanic. Today the remaining neighborhoods with mostly Italian American populations is South Shore of Staten Island, and South Brooklyn especially Gravesend, Bath Beach, etc.
Irish: Similar to above the Irish came here to NYC more earlier than Italians during the potato famine but in droves in the late 19th century to early 20th century. Like Above the Irish and Italians have been predominantly associated with the city with NYPD, NYFD having Irish commissioners, and with St Patrick's church in Manhattan being the most notable. Like above the irish mostly live in the suburbs but there is a neighborhood of Queens having a mostly Irish population mostly NYPD folks living there.
More groups such as Dominicans, Chinese, Koreans, Russians discussed later.      

[Roll Roons]

Indians: Jersey City NJ

Nah, I'd say Edison or Plainsboro.

[sting in the rafters]

Polish: Buffalo (Just look at the Gronk brothers!)
Mexicans:Surprisingly Kennett Square due to the numerous migrants on the mushroom farms.
Scotch-Irish:Appalachia

[Ethelberth]

Finns, Fitchburg Massachusetts. Mainly historical, but it used to be important.

[Born to Slay. Forced to Work.]

Finns, Fitchburg Massachusetts. Mainly historical, but it used to be important.

I've always associated Fiinns with northern minnesota

[Sol]

Finns, Fitchburg Massachusetts. Mainly historical, but it used to be important.

I've always associated Fiinns with northern minnesota

The historic pattern of Finnish immigration to the US is kind of interesting in that it doesn't really track with other Scandinavian immigration patterns in the same way--there's some in the agricultural upper Midwest to be sure but it more closely parallels historic heavy industry. That's certainly true of Northern MN/WI/ and the UP, which is historically the biggest stronghold, but there was a big Finnish presence in Ashtabula, Fitchburg, Western MT, etc. Those resulting union ties, along with a tendency for new immigrants to have been on the red side of the Civil War, meant that Finnish demographics was strongly correlated with far-left, at times communist politics.

(There was a Finnish-language Communist newspaper based in Hancock and Superior which was published until the late 90s!)

[It’s so Joever]

Pakistanis: New York NY
Panamanians: New York NY
Paraguayans: Bernardsville NJ
Peruvians: Paterson NJ
Pinoys: Daly City CA
Polish: Chicago IL
Portuguese: Fall River MA
Puerto Ricans: New York NY (soon will be Buenaventura Lakes)
Romanians: New York NY
Russians: New York NY
Samoans: Honolulu HI
Arabians: Dearborn MI
Senegalese: New York NY
Serbians: Chicago IL
Slovaks: Pittsburgh PA
Slovenes: Cleveland OH
Somalis: Minneapolis MN
South Sudanese: Omaha NE
Sri Lankans: New York NY
Palestinians: Paterson NJ
Sudanese: Omaha NE
Swedes: Lindstrom MN
Swiss: New Glarus WI
Syrians: Paterson NJ
Taiwanese: New York NY
Thais: Los Angeles CA
Trinidadians: Naranja FL
Turks: Paterson NJ
Ugandans: Los Angeles LA
Ukrainians: Chicago IL
Uruguayans: New York NY
Uzbeks: New York NY
Venezuelans: Doral FL
Vietnamese: Westminster CA
Yemenis: Dearborn MI

[thebeloitmoderate]

Here we go again on just how Diverse of a melting pot that NYC is.
Chinese : There were some Chinese immigrants moving to New York around the mid 1800s until 1882 when the Chinese exclusion act was passed. Even after that act was passed The vast majority of Chinese americans in New York were male. After 1943 when that act was repealed, more women and some men came to New York City. Initially Chinatown manhattan acted as the enclave of Chinese Americans. Once the 1965 Immigration act was passed immigration from China and other non European countries exploded. Nowadays More Chinese Americans in New York City live in Brooklyn or Queens than in Manhattan itself.
Russians: Unlike other European groups, Russians came to New York city way later in the 19th century. When Russia was suffering from Pogroms in the early 1880s Both Jewish and Non Jewish Russians began to come to America but mostly on the West Coast and only a few came to New York City. It was not until WW1 that a bigger group of Russians began to migrate to New York City, the Russians that migrated to NYC during WW1 mostly settled in Manhattan, and a few in Brooklyn. At the end of the Cold War and also during former event Most Soviet immigrants came to New York and helped re establish the Brighton Beach neighborhood while at the same time moving to Queens, and some to Hamilton Heights which was suffering from White Flight.
Dominicans: Dominicans in New York mostly began to move there around the mid to late 60s to early 70s as the Immigration act was passed. Similar to Puerto Ricans Dominicans in NYC live in the Bronx, but they have their own community in upper Manhattan from Inwood to Hamilton Heights.

[Sol]

Vietnamese: entire West Coast + Gulf Coast- particularly SoCal (Orange County), Bay Area (Santa Clara County), and Metro Houston- but also Nebraska, Atlanta, and Boston

Something which I found out recently is that in addition to the unsurprisingly large community along the Buford Highway, there's a sizable Vietnamese community in along Jonesboro Road in northern Clayton County. Morrow is around 30% Asian, nearly as Asian-American as Johns Creek.

[cg41386]

Iranians: Great Neck, NY

[TDAS04]

Punjabi Mexicans: Yuba City, CA
Luxembourgers: MN/IA/WI/IL
Icelanders: Red River Valley of MN/ND (Manitoba, Canada has the most outside Iceland)
Hawaiians (on the Mainland): Las Vegas

[Kuumo]

Basques: Boise, ID
Samoans: Salt Lake City, UT
Tongans: Salt Lake City, UT

[King of Kensington]

Punjabi Mexicans: Yuba City, CA
Luxembourgers: MN/IA/WI/IL
Icelanders: Red River Valley of MN/ND (Manitoba, Canada has the most outside Iceland)
Hawaiians (on the Mainland): Las Vegas

Since you mentioned Manitoba I'll add Mennonites, Ukrainians and Filipinos. 

[Hope For A New Era]

Polynesians (all, but especially Samoans and Tongans) - Utah (all, but especially West Valley City)

Nigerian - Missouri Turns out this doesn't have basis in reality

Where did this come from?

Missouri's immigrant groups are Bosnians in St. Louis and (to a much lesser extent) Vietnamese, Somali, and Sudanese in Kansas City.

[The Right Honourable Martin Brian Mulroney PC CC GOQ]

Punjabi Mexicans: Yuba City, CA
Luxembourgers: MN/IA/WI/IL
Icelanders: Red River Valley of MN/ND (Manitoba, Canada has the most outside Iceland)
Hawaiians (on the Mainland): Las Vegas

Since you mentioned Manitoba I'll add Mennonites, Ukrainians and Filipinos. 

Winnipeg alone has a Filipino population of 80,000. For comparison, all of New York State has 140,000. Pretty crazy how one of the largest Filipino diasporas in North America emerged in Manitoba of all places.

[𝕭𝖆𝖕𝖙𝖎𝖘𝖙𝖆 𝕸𝖎𝖓𝖔𝖑𝖆]

Basques: Boise, ID
Samoans: Salt Lake City, UT
Tongans: Salt Lake City, UT

Much less known but another place with a large Tongan community I learnt about a while ago is Euless, TX (a suburb of Dallas).

[King of Kensington]

Finns: Thunder Bay, Ontario

Highland Scots: Cape Breton, Nova Scotia

[MyLifeIsYours]

Irish: South Boston

[Sol]

Basques: Boise, ID
Samoans: Salt Lake City, UT
Tongans: Salt Lake City, UT

Much less known but another place with a large Tongan community I learnt about a while ago is Euless, TX (a suburb of Dallas).

Also quite Nepalese too apparently.