The United States is home to the second largest Haredi population, with a growth rate on pace to double every 20 years. With slightly over 300,000, the U.S. Haredi population is only 1/3 the size of Israel's. An overwhelming majority of U.S. Haredi Jews (89%) live in the Northeast, primarily in New York and New Jersey, according to Pew.
The Canadian Haredi population is primarily concentrated in Montreal and Toronto.
The UK has large Ultra-Orthodox communities in north London, Salford and Gateshead. The Hasidic community of Stamford Hill in north-east London, over 30,000 strong and growing at a rate of around 5% each year, is known to have the largest concentration of Haredi Jews in Europe.
50% of Jewish children and around 30% of young Jewish adults in the UK will be strictly Orthodox by 2031. -- Institute for Jewish Policy Research, Strictly Orthodox Rising.