Are there any open data portals that handle privacy controls and publish datasets from multiple agencies?

Yes — there are several open data portals that support privacy controls and aggregate datasets from multiple agencies. A few notable examples:

1. US Data.gov

• Role: Federal open data portal for the United States.
• Multi-agency: Yes, it aggregates datasets from many federal agencies, plus some state/local contributors.
• Privacy controls: Datasets are typically reviewed by the publishing agency; sensitive or personally identifiable information is supposed to be removed before publication. The portal itself also supports metadata, licensing, and access controls for non-public or restricted records in some agency workflows, though the public portal is mainly for open datasets.

2. EU Open Data Portal

• Role: Central portal for EU institutions, agencies, and bodies.
• Multi-agency: Yes.
• Privacy controls: Datasets are published under EU rules, including GDPR-related handling where applicable. Sensitive datasets are generally anonymized or excluded from public release.

3. UK Data Service / data.gov.uk

• Role: UK government open data portal.
• Multi-agency: Yes, it includes datasets from many departments and public bodies.
• Privacy controls: Public datasets go through departmental release processes; data protection and anonymization requirements apply before publication.

4. Open Data portals based on Socrata / CKAN

Many governments and cities use platforms like:

• CKAN (open-source)
• Socrata (commercial)

These can support:

• role-based access
• private/staged datasets
• approval workflows
• anonymized/public versions of records
• publishing from multiple departments or agencies

Examples include city, state, and national portals such as:

• New York City Open Data
• California Open Data
• Chicago Data Portal

5. Health and research data portals

Some multi-agency portals also handle stricter privacy controls, for example:

• NIH / data repositories
• CDC open data
• Australia’s data.gov.au with agency-managed releases

These often publish aggregated or de-identified datasets and may support secure access for restricted data.

Important caveat

A truly “privacy-aware” open data portal usually does not automatically guarantee privacy. In practice:

• the publishing agency is responsible for de-identification and legal review
• the portal provides workflows, metadata, and access controls
• sensitive data is often either excluded, anonymized, or moved to restricted-access systems rather than made fully public

If you want, I can also give you:

1. a short list of the best portals by country, or
2. a feature comparison table of CKAN vs Socrata vs custom government portals.