The couple, who are expecting their second child in April, will visit New York City and Washington, DC, for three days, their first official visit to the US in three years.
The Daily Mail reported that the Senate Periodical Press Gallery had emailed its members with expected behaviour. These include "not taking pictures in the wrong places, not walking backwards and not being so absorbed in a phone as to run into people."
It continued: "Those wearing jeans or trainers will not be admitted and casually dressed members of the media will be turned away."
The couple's engagements include promoting sustainable conservation issues, young people's mental health and supporting disadvantaged young people.
The Prince will attend an anti-corruption conference at the World Bank, focusing on the transportation of illegal wildlife parts across borders.
William will push for a "zero tolerance" approach to the trade in ivory and other illegal wildlife parts, the Daily Telegraph reported.
He will stress that the demand for products such as rhino horn in the developed world drives the poaching of endangered species and is linked to money-laundering and corruption.