Society of American Travel Writers (SATW)
http://www.satw.org/
The oldest travel journalism organization in the US. Open to American and Canadians. To qualify for membership as blogger you need to average 10,000 unique visitors per month over a 12 month period and 1 member to sponsor you. You can also gain membership through freelancing or by winning a Lowell Thomas Award.
British Guild of Travel Writers (BGTW)
http://bgtw.org/
The premier travel journalism group for the UK/Ireland. To qualify as a blogger you must have “a blog that is updated at least fortnightly and has at least 3,000 visitors a month and a Mozrank of over 4”.
Australian Society of Travel Writers (ASTW)
http://astw.org.au/
It is unclear if/how bloggers can join. Membership requirement seem to be based on the number of words/photos published per year.
Travel Media Association of Canada (TMAC)
http://www.travelmedia.ca/
Travel media group for Canadians. They only just started accepting bloggers. Membership requires 2 members who are sponsors and you have to meet a certain number of qualification points. Just doing a brief check for myself, I easily qualified and only 10 of the necessary 50 points involve traffic.
North American Travel Journalists Association (NATJA)
http://natja.org/
Not actually a member run organization. Best known for its annual awards competition. NATJA awards are easier to win than Lowell Thomas Awards because there are many more categories and they split print/digital awards. Qualification is very easy as only have to submit 8 articles from the last 12 months.
American Society of Media Photographers (ASMP)
http://asmp.org/
Great member benefits. Have to be a professional photographer and have 2 members sponsor you. One of the most professional organizations I’m a member of. Lots of professional development.
The International Food Wine & Travel Writers Association (IFWTWA)
http://ifwtwa.org/
A global organization. Membership requirements are not that hard if you post on a regular basis and have been doing so for at least a year.
North American Nature Photography Association (NANPA)
http://www.nanpa.org/
A North American organization, but open to members globally. Not a professional organization per se. It is open to all photographers and there are no membership requirements. They have a very active Facebook group (I am a member).
Outdoor Writers Association of America (OWAA)
http://owaa.org/
Bloggers can join and the only requirement is a website “that is updated with original content at least twice a month and receives 500 AUVs (Average Unique Views) per month over a 12-month period, or generates income.” That is a pretty low threshold.
Midwest Travel Writers Association (MTWA)
http://www.mtwa.org/
There is no explicit requirement allowing bloggers to join. Their website only says: “Other travel-related media will be considered on a case-by-case basis.” This really seems more like a club than anything else. THREE sponsors are required, and there is a membership requirement that you attend the meetings. I am not aware of any people who primarily identify as bloggers who are members.
Bay Area Travel Writers (BATW)
http://www.batw.org/
Organization is (obviously) centered around the San Francisco Bay area. Open to bloggers. Website states that blogs must “Consistently average a minimum 3,000 absolute unique visitors per month (AUVs) over one year”. Your blog must also make money directly or indirectly.
North American Snowsports Journalists Association (NASJA)
http://www.nasja.org/
Membership is actually handled by the regional groups (East, West, Midwest). To qualify as a blogger you must have been blogging for 1 year, proof of income, 4 updates per month, and 5,000 pageviews per month.
Professional Photographers of America
http://www.ppa.com/
Despite the name, there are membership categories for Canadians and International members. There are no requirements per se other than paying dues. They offer a LOT of online courses and online “degrees”. It is mainly for photographers who are running a photography business. Good member benefits on insurance.