The phrase "a main office" is correct and usable in written English.
It can be used to refer to the primary location or headquarters of a business or organization.
Example: "The company has several branches, but all major decisions are made at a main office located in the city center."
Alternatives: "the primary office" or "the headquarters".
The Marine representative said he was downtown at a main office, but he would be in Times Square later.
As a $600-million 600-millionodiva doesn't have to worry mucolossus a $1.2-million-a-year pipsqueak like Madécasse, a chocolate start-up, with a main office in Brooklyn, that prides itself on a bean-to-bar ethos.
Mr. de Mistura said the United Nations' international staff in Iraq was 250 to 300 people, with a main office in Baghdad and smaller ones in Basra and Erbil.
There are strong indications that Xuzhou Anying, a company with a main office that seems to consist of just two rooms and an adjoining warehouse here, possessed substantial supplies of melamine and even sought to buy quantities of it over the Internet.
The one stranger that Americans still widely permit to enter backyards and basements could eventually be replaced by automated systems that collect and transmit highly accurate, regularly updated information from electric, gas and other meters to a main office, untouched by human hands.
The company currently has 50 employees with a main office is in Cary, North Carolina.
She went to Cooks, Mackay Radio, to a branch post office, to a main post office.
The study group consisted of 43 mail carriers who were randomly selected from 215 full-time mail carriers working in a main post office of Taichung City, Taiwan.
Founded only in 1995, it has a dozen staff in Brussels, a second main office in Washington, and 20 or so field officers around the world.
Describing the BHA as "profligate", he attacked them for maintaining an expensive main office in central London.
Although there are ways you can dress that are safe, asking an employee or doing a walk-by the main office will tell you if the company expects business formal or business casual.
