diff --git a/src/__tests__/data/reformDefinitionCode.test.js b/src/__tests__/data/reformDefinitionCode.test.js
index 4521fbd93..5215a0593 100644
--- a/src/__tests__/data/reformDefinitionCode.test.js
+++ b/src/__tests__/data/reformDefinitionCode.test.js
@@ -7,6 +7,7 @@ import {
   getImplementationCode,
   sanitizeStringToPython,
 } from "data/reformDefinitionCode";
+import { POPULACE_US_DEFAULT_DATASET_URI } from "data/countries";
 import {
   baselinePolicyUS,
   baselinePolicyUK,
@@ -262,7 +263,7 @@ describe("Test getImplementationCode", () => {
     expect(output).toBeInstanceOf(Array);
     expect(output).toContain("baseline = Microsimulation(reform=baseline)");
   });
-  test("If US state, return lines with pooled 3-year CPS dataset", () => {
+  test("If US state, return lines with the certified populace-us dataset", () => {
     let testPolicy = JSON.parse(JSON.stringify(baselinePolicyUS));
     testPolicy = {
       ...testPolicy,
@@ -286,10 +287,10 @@ describe("Test getImplementationCode", () => {
     );
     expect(output).toBeInstanceOf(Array);
     expect(output).toContain(
-      'baseline = Microsimulation(dataset="hf://policyengine/policyengine-us-data/pooled_3_year_cps_2023.h5")',
+      `baseline = Microsimulation(dataset="${POPULACE_US_DEFAULT_DATASET_URI}")`,
     );
     expect(output).toContain(
-      'reformed = Microsimulation(reform=reform, dataset="hf://policyengine/policyengine-us-data/pooled_3_year_cps_2023.h5")',
+      `reformed = Microsimulation(reform=reform, dataset="${POPULACE_US_DEFAULT_DATASET_URI}")`,
     );
   });
   test("If dataset provided, return lines with dataset", () => {
@@ -303,10 +304,10 @@ describe("Test getImplementationCode", () => {
     );
     expect(output).toBeInstanceOf(Array);
     expect(output).toContain(
-      'baseline = Microsimulation(dataset="hf://policyengine/policyengine-us-data/enhanced_cps_2024.h5")',
+      `baseline = Microsimulation(dataset="${POPULACE_US_DEFAULT_DATASET_URI}")`,
     );
   });
-  test("If dataset provided alongside US state, return lines with dataset, not Pooled 3-Year CPS", () => {
+  test("If dataset provided alongside US state, return lines with dataset, not the state fallback", () => {
     const output = getImplementationCode(
       "policy",
       "ks",
@@ -317,7 +318,7 @@ describe("Test getImplementationCode", () => {
     );
     expect(output).toBeInstanceOf(Array);
     expect(output).toContain(
-      'baseline = Microsimulation(dataset="hf://policyengine/policyengine-us-data/enhanced_cps_2024.h5")',
+      `baseline = Microsimulation(dataset="${POPULACE_US_DEFAULT_DATASET_URI}")`,
     );
   });
 });
diff --git a/src/data/countries.js b/src/data/countries.js
index bd652d604..702900c57 100644
--- a/src/data/countries.js
+++ b/src/data/countries.js
@@ -53,12 +53,21 @@ export const STATUS_TEXT_COLORS = {
   Pending: colors.BLACK,
 };
 
+// The certified populace-us dataset that policyengine.py resolves as its
+// default US microdata (see src/policyengine/data/bundle/manifest.json's
+// data_releases.us.default_dataset_uri in PolicyEngine/policyengine.py).
+// This pins the certified revision so "Reproduce in Python" snippets stay
+// byte-reproducible; bump the revision suffix when populace-us is
+// re-certified (see PolicyEngine/populace#204 for the migration history).
+export const POPULACE_US_DEFAULT_DATASET_URI =
+  "hf://policyengine/populace-us/populace_us_2024.h5@populace-us-2024-sparse-l0-refit-57k-71a0887-national-only-20260701";
+
 // Map dataset keywords to their equivalents
 // in the actual US package; at the moment,
 // this only applies to the "enhanced_cps"
 // dataset selection
 export const DEFAULT_DATASETS = {
-  enhanced_cps: "hf://policyengine/policyengine-us-data/enhanced_cps_2024.h5",
+  enhanced_cps: POPULACE_US_DEFAULT_DATASET_URI,
 };
 
 const DEFAULT_US_HOUSEHOLD = {
diff --git a/src/data/reformDefinitionCode.js b/src/data/reformDefinitionCode.js
index a65c4c5a5..d7a00d123 100644
--- a/src/data/reformDefinitionCode.js
+++ b/src/data/reformDefinitionCode.js
@@ -1,6 +1,6 @@
 import { optimiseHousehold } from "../api/variables";
 import { defaultYear } from "./constants";
-import { DEFAULT_DATASETS } from "./countries";
+import { DEFAULT_DATASETS, POPULACE_US_DEFAULT_DATASET_URI } from "./countries";
 import { wrappedJsonStringify } from "./wrappedJson";
 
 export function getReproducibilityCodeBlock(
@@ -184,8 +184,10 @@ export function getImplementationCode(
   if (hasDatasetSpecified) {
     datasetText = DEFAULT_DATASETS[dataset];
   } else if (isState) {
-    datasetText =
-      "hf://policyengine/policyengine-us-data/pooled_3_year_cps_2023.h5";
+    // State-level runs use the same certified populace-us national dataset;
+    // state regions scope it by state_fips rather than shipping a separate
+    // state-level file (see PolicyEngine/populace#204).
+    datasetText = POPULACE_US_DEFAULT_DATASET_URI;
   }
 
   const datasetSpecifier = datasetText ? `dataset="${datasetText}"` : "";