The phrase "are primarily located" is correct and usable in written English.
It can be used to describe the main or predominant places where something is found or situated.
Example: "The majority of the species are primarily located in tropical rainforests."
Alternatives: "are mainly found" or "are chiefly situated".
Agencies are primarily located in New York's Westchester County with a few in New York City.
Globally, the dry soils are primarily located in southeast North America, North Africa, southwest Europe, central Asia and Australia.
One of several bidders, ICD originally bid for the entire company, but eventually settled for the commercial properties, which are primarily located in Madrid, Barcelona and Paris.
"We present strong evidence that cannabis and cocaine vendors are primarily located in a small number of consumer countries, rather than producer countries," they say.
The BME offices are primarily located in the Clark Center and on the 2nd floor of building 520, 452 Escondido Mall.
Our laboratories are primarily located on the first and second floors of the Edwards building with a satellite lab located in the Stanford Stem Cell Institute.
The results re-established the theoretical corroboration that the carboxyl groups are primarily located at the edges of the 2D sheets of GO.
This study was designed to determine whether the receptors mediating these behaviors are primarily located in the brain or in the periphery.
People there tell you that except for the famous Strip, where the big hotels and gambling casinos are primarily located, it is a town 30 years voted overwhelmingly for the Republican presidential candidate.
By physical-chemical characterization it was observed that nanoparticles of the LaMnO3±δ perovskite phase are well dispersed in the carbon matrix and are primarily located in the mesopores and small macropores of the Vulcan carbon.
They are primarily located in the choroid beneath the RPE or under the neuroretina.
