Women's shoes in extended sizes in the US
Online fashion giant ASOS offers free US shipping (with minimium spend) and returns. They have a huge range of shoes in size 11-11.5 US. Plus over 100 of their own brand styles go up to size 12 US with a smaller range now available in size 13 US too - all at very affordable prices. While I find their size 11s true to size, reviews here suggest the 12s & 13s may run small, so you may need to size up. Most items are shipped from within US. If some items will ship from UK instead, the free shipping option may not be available. But there are no import duties or taxes, or ASOS will refund these to you.
US brand Lonia offer high quality fashionable, colourful footwear up to size 15 US. Note that returns are for store credit only. Lonia also offer a custom shoe design service up to size 16 US. Worldwide shipping available.
High end discount store which sells online & also has many stores across the US. You can get up to size 13 US shoes online, sometimes even larger. Size selection in store may not be as good as online. Read more about Nordstrom Rack New York City branches.
US department store chain with a great range of fashionable & glam styles up to size 12 US, a smaller range in 13 US and a few 14 US women's shoes too. Most widths catered for too. Free US shipping with minimum spend. Dillard's also have lots of retail stores across the USA if you prefer to shop or return in person. They also ship to most countries worldwide via Borderfree with the option to see & pay the full amount including taxes & duties at checkout, so there are no extra charges to pay on delivery.
US chain Maurices have nearly 900 stores across US & Canada & also ship online to both. They have a nice range of cute shoes at affordable prices up to size 12 US. They mainly do casual shoes, boots and summer sandals. Free US shipping & flat rate to Canada. Store returns are free.
US brand J Renee are particularly good for occasion wear, including bridal shoes. They also do boots and a range of more casual slip ons and sneakers. Select styles go up to size 13 US. Medium (A/B), wide (C/D) and double wide (E) widths are available. Free US shipping with min spend & free US returns too. J Renee ship to most countries worldwide. Note that if you filter shoes by size or width, it remembers your choices for further searches without making this clear. So if you need to change width or size use the 'reset' button to make sure you get all results.
US online brand with hundreds of fashionable shoes & boots available up to size 12 US. Wide range of colours and dressy / smart styles with some cute sneakers available too. Free shipping with minimum spend (from Utah) & free returns option.
Huge variety of shoes in size 11-13 US, with a smaller selection up to 16/17 US. Ships to USA only. Note that there is an $8.50 admin fee deducted for returns but you don't have to pay return postage. Wide range of brands to suit all budgets. There are regular sales and discount codes and you can find current deals here.