There's always more to be said, but in the meantime you can find more information about loyalists during and after the revolution in this post from u/enygma9753.

Most accepted historical estimates suggest that about 1/5th of the white population in the Thirteen Colonies were loyalists. This would be roughly half a million out of 2.5M colonists. This does not include the various indigenous tribes and blacks who took up arms for the Crown. A majority of the Iroquois Confederacy sided with Britain, with a minority on the Patriot side. Loyalist militia numbered around 19,000, while escaped black slaves who enlisted with the British due to promises of freedom totalled up to 20,000.

Some historians suggest that up to 1/3rd of the colonists were committed loyalists, 1/3rd committed Patriots and the remaining 1/3rd were lukewarm loyalists or neutral, and wavered between sides depending on who held the territory at the time.

At the end of the Revolution, appproximately 60,000 - 80,000 loyalists left America. While some left voluntarily on their own, the majority of them were labourers, farmers and craftspeople in the lower classes who had been driven forcibly from their homes -- either by official state acts that deprived them of their legal rights and property, or by Patriot mob violence and persecution. Black loyalists, under threat of enslavement in America, fled either on British ships during the initial loyalist exodus or fled on their own.

Half of these loyalist exiles (some 35-40,000) migrated to Canada, while the remainder moved to the Caribbean, Britain, or the new colony of free blacks in Sierra Leone.

Most loyalists, however, remained in the US after the war and were soon assimilated into the local population.