Broken Hill has sister city relationships with Bankstown, NSW, Taixing, China and recently commenced a cultural exchange relationship Banska Stiavnica, Slovakia and contact has also been established with Blato, Croatia. In 2010 a three-way cultural relationship between cities with a proud mining heritage, Broken Hill City Council, Rio Tinto and Slovakian mining trailblazer, Banska Stiavnica was established and is progressing.

In 2011, the Sister City relationship between Broken Hill and Bankstown celebrated its Silver Anniversary, hosted in the Silver City - it was a great success.

It all began in the late 1970's; the Brushmen of the Bush exhibited their art at Bankstown Town Hall. The artists donated 25 per cent of their takings to a charity of Council's choice - a youth refuge. Another exhibition followed and both councils began to think about forming stronger links. They realised that opportunities could be provided for people from both cities to experience a totally different way of life.

The vast majority of Sister City relationships are between cities in different countries or at least in different States. It is therefore almost unique for two cities in the same State to be paired together, but if ever two cities were meant to be Sister Cities, it is surely Bankstown and Broken Hill.

On 16 September 1986, the mayors of Bankstown and Broken Hill signed a Sister City agreement. The first program run between the two cities was a youth sporting event which has continued as an annual exchange ever since. Thousands of young people have competed in friendly sporting matches between both cities and lifelong friendships have been formed.

Bankstown's Talent Advancement Program (TAP) performers have also taken part in the Sister City Cultural Exchange and in 2007; the Broken Hill/Bankstown Sister City relationship celebrated its 21st anniversary.

To date, the predominant focus of the relationship between the two Councils has centred on visits and sporting exchanges involving children and youth and while these visits have always been very successful, both Councils agree it is important to expand the current sister city relationship and explore new areas of cooperation including; Employee exchanges between the two Councils, resource and data sharing, community exchange initiatives involving schools, sporting and service clubs, cultural and community groups, and business to business links, exchanges, networking and support.