In recent years, the number of NGOs has been growing by around 500 per year. On 17 September 2012 22,490 associations, 2,324 institutes and 251 foundations were registered. Not all registered NGOs are necessarily active. In accordance with the established practice, active organisations are those submitting their annual reports to AJPES, which is cca. 3 % less than the number of registered organisations. The data on active NGOs is only accessible for previous years and likely to be available each September when AJPES has processed aggregated data on submitted annual reports. In 2018, there were just below 27,000 active associations, institutes and foundations.

The data on associations also comprise data on society branches and youth councils, and data on institutes comprise data on religious communities having the humanitarian organisation status. The data exclude the associations, institutes and foundations that have been established by the Republic of Slovenia, municipalities or other public sector entities.

In 2020, the number of active non-governmental organisations has slightly increased compared to the previous year. The number of associations has decreased by 0.25% (as in 2019), the number of institutes increased by 2.52% (the growth in 2019 was 2.36%), and the number of foundations increased by 3 % (the growth in 2019 was 0.43%). In 2020, the combined annual growth index of the number of all non-governmental organisations was 0.12 %.

The largest share by far among all non-governmental organisations is taken up by associations with 86.61 %. The smallest percentage – only 0.9 % – pertains to foundations, and there are also 12.49 % institutes. In the last five years, the share that has increased the most was that of institutes, of which there were less than 7% of all NGOs in 2009.